2.1 Climate change and tourism: global challenges

Under a climate change scenario, it is essential to reflect on the theme in relation to the global context, its causes, and consequences. As a direct impact, climate change is related not only to the loss of biodiversity and increase in natural hazards but also to social impacts as it threatens the economic growth and political stability of nations. Ac-cording to ^{Santos (2000}), "climate change can be understood as all forms of climatic inconstancy, regardless of its statistical nature or physical causes", and can be analyzed at various time and spatial scales (p. 66).

Since the Industrial Revolution, in the 18th century, the use of fossil fuels, such as coal and petroleum products, has intensified. The growing use of these elements has caused the composition of the atmosphere to change, increasing the amount of long-lived gases, especially CO₂.

The Intergovernmental Panel on Climate Change - IPCC (2014), in its latest report reaffirmed that climate change is happening and its causes are derived from anthropogenic activities. The report, entitled "Climate Change 2014: Impacts, Adaptation, and Vulnerability," was prepared by the IPCC Working Group II and details the impacts of climate change. The document concludes that the response to climate change involves making choices about risks in a changing world.

The contradictions between the style of development adopted by the countries and their support for nature are visible. Climate change directly affects the basic elements of life on the planet, such as access to water, food production, health, and the environment, causing increased pressure on natural resources combined with growing urbanization, industrialization, and economic development.

In this context, one of the areas affected by climate change is the tourism industry. According to the document "Climate Change and Tourism: Responding to Global Challenges", prepared by the World Tourism Organization (UNWTO), in partnership with the United Nations Environment Program (UNEP) and the World Meteorological Organization (WMO), resulting from the 2^nd Inter-

national Conference on Climate Change and Tourism (Davos, Switzerland, 1-3 October 2007), climate change will affect tourism destinations, their competitiveness, and sustainability in four major areas: Direct climate impacts; Indirect impacts of environmental changes; Impacts of mobility policies and the reduction of tourism; and Indirect impacts of social change (Brasil, 2008).

The Conference brought together people from various sectors to review recent developments on the topic and prospects. The Davos Declaration (2007) recognized climate change and its strong relationship with tourism. It also acknowledged the need for a long-term strategy for the industry to reduce GHG emissions and concrete initiatives by governments, companies, consumers, and research and communication networks to raise awareness and education on climate change (OMT, 2007).

Following the Davos Conference, issues related to climate change and tourism have surfaced in the discussions at the Ministerial Summit held in London on November 13, 2007, UNWTO General Assembly in Cartagena de Indias (Colombia) from November 23 to 29, 2009 and the United Nations Conference on Climate Change (COP 21) held in Paris in 2015. The COP 21 was endorsed by 195 countries with the goal of reducing GHG emissions in the context of sustainable development. The meetings considered that tourism must find common ground on addressing climate change.

The climate is among the factors that motivate and determine much of the tourist flows and trends. However, climate change has affected many tourist destinations, where extreme events of drought, storm, large quantities of rain, and hurricanes among others, have made many regions and global communities vulnerable to these events. But just as it is influenced by climate change, tourism has contributed to global warming.

According to ^{Peeters et al. (2017}), the environmental impacts of tourism that contribute to GHG emissions derive from energy consumption, use of fossil fuels, and the transportation of tourists. Such impacts constitute the most urgent environmental problem related to tourism, imposing on the industry the challenge of finding mechanisms to reduce environmental impacts, leading countries to reduce carbon dioxide (CO₂) emissions, one of the elements responsible for global warming.

Despite the new challenges, until recently, both the tourism sector and the academic community, have done little research on the impacts of climate change on tourism and, conversely, on the weight tourism and related activities have had on global environmental change (^{Scott et al., 2009}).

In any case, tourism segments⁴ exposed to extreme weather events may increasingly be affected by climate change, with impacts on their infrastructure, and requiring emergency preparedness measures, increasing maintenance costs, and sometimes disrupting commercial activity (^{Scott et al., 2012}; Fit chett et al., 2016). This means, according to the UNWTO (2007), that even under current conditions, the profitability and viability of tourist destinations are partially influenced by the climate.

The increase in global temperature could shorten the winter, reducing the ice sheets and, in addition to reducing the tourism potential of ski resorts, could even make tourism unfeasible, generating an entire economic and social problem in the most affected regions. However, in the same way that climate change can impair tourism in well-known regions, it may highlight the tourism potential of regions that have not been explored. In any case, it is important to acknowledge the reciprocal relationship between tourism and climate change, how this will affect tourism, and how tourism-related pollution contributes to global warming (^{Scott et al., 2009}; Ficchett et al., 2015).

Therefore, the strategy is to encourage initiatives that lead to a series of changes. These include the use of clean energy, stricter legislation on the conservation of natural ecosystems, environmental education, improvement of agricultural practices, reduction of consumption and waste, adequate environmental and tourism policy, among others, thus ensuring sustainability for future generations.

2.2 Consequences of climate change: observed scenarios for tourism

Scenarios, according to the IPCC, are images of the future; they are neither forecasts nor predictions. They allow establishing and assessing the socioeconomic and environmental vulnerability of pre-climate change reference, determining the impacts of those changes, and assessing vulnerability after adaptation (IPCC, 2001).

The main scenarios used in climate change research are emissions, climate, environmental, and vulnerability (^{Koumrouyan, 2010}). In Table 1 these scenarios are identified according to ^{Stern (2006}); UNWTO (2007); ^{Moreno (2010}); ^{Grimm et al.; IPCC (2013}); and the Brazilian Panel on Climate Change - PBMC (2014), trends adopted as a reference, projections with global climatic changes from two moderate scenarios of temperature rise (+ 2 °C and + 3 °C), and incorporating the effects of the changes in different sectors including tourism.

The causes and consequences of climate change resulting from temperature rise are global in scope (IPCC, 2007). Nevertheless, it manifests itself differently across the diverse regions of the world (^{Stern, 2006}; ^{Welzer, 2010}). Poor countries should face the greatest consequences even if they are not responsible for most GHG emissions. Climate change could affect the most basic life-supporting elements such as access to water, food production, health, and the environment, causing increased pressure on natural resources coupled with major urbanization, industrialization, and economic development.

Climate change affects tourism having a direct and main relationship with water scarcity. Climate change should also affect beach tourism destinations, where sea-level rise may harm the portion of the population living in the coastal zone due to the concentration of people and services available in these regions (^{Kron, 2008}).

^{Carmo and Silva (2009}) assessed the portion of population exposed to the risk of sea-level rise and identified 24.3 million inhabitants living in urban coastal areas, who are most directly at risk. In relation to tourism, the authors identify that the effects should be felt in the increase of flood events and the aggravation of erosive processes (loss of beach, for example). In addition, the urban and tourist infrastructure located in the coastal zone could be damaged.

Reflecting on the magnitude of potential effects of climate change on the tourism industry, ^{Moreno (2010}) points out that the IPCC AR4 report (2007) on impacts, adaptation, and vulnerability clarifies that there is considerable diversity where tourism is treated regionally, revealing important geographical gaps in literature and research. In other words, in the IPCC report (2014), tourism receives little or no attention. Discussions on the theme would have been expected, for example, on the effect of heat waves on tourism, and competition for water between tourism and other sectors, but this has not been the case. The subject is also poorly addressed in the sustainability chapters and in the interrelationships between adaptation and mitigation.

Adaptation is understood as the possible responses of ecosystems to the current and potential impacts of climate change, seeking to minimize possible anomalies and to explore potential opportunities. Mitigation can be understood as actions that reduce the use of natural resources and implement measures that reduce GHG emissions and benefit the recovery, regeneration, and creation of sinks (^{Grimm, 2016}).

Considering the above and observing the complexity of the impacts of climate change for all economic sectors, and considering the interactions between the social and ecological systems, interdisciplinary studies and research are necessary to consider the factors of vulnerability at multiple scales. Whereas the responses to the impacts of climate change will consist primarily of individual responses at the local scale, it is necessary that this multi-scale approach be applicable to the analysis of the adaptive capacity at the level of the communities (^{Dolan & Walker, 2004}). In this context, tourism must be inserted in the research, as it constitutes a development alternative for nations that depend on it economically.

3.1 Research instrument

The research instrument was a structured interview composed of questions on the relationship between tourism, climate change and sustainable development. We invited the experts and sent the questionnaires via telephone or e-mail, informing the objectives of the research. After the questionnaires were returned, data validity was checked. At this point, the return of the questionnaires was satisfactory, and it was not necessary to request clarification or further information.

Because this is a very specific research, a questionnaire was prepared and sent to the collaborators, to respond to the research objective: to analyze the impacts, opportunities, and challenges for the sustainable development of tourism in Brazil, under global climate change scenarios. The questions were: i) In the face of climate change, what are the expected impacts on the tourism industry in Brazil and in the world? ii) Is it possible to articulate mitigation and adaptation actions of the industry facing the challenges of climate change? iii) Under climate change scenarios is it possible to point out opportunities and challenges for the development of tourism? iv) To what extent does the creation or maintenance of Conservation Units become an element of regulation and mitigation of GHG emissions? v) Is it possible to promote a low GHG emission development, with tourism as an activity that contributes to this reduction?

From the collected data it was possible to organize the contributions of the experts in different fields and, together with the data obtained in the bibliometric research, to put them into perspective and establish the theoretical construct and results.

3.2 Data analysis

Content analysis was conducted so that data become meaningful and valid. In this sense, the analysis categories: climate change, tourism and development, adaptation, mitigation, and low carbon served to transform the information obtained from the experts into interpretable and meaningful data according to the research objective.

Cross-checking of data was organized around the categories that consisted in identifying core meanings in the experts’ contributions. According to ^{Bardin's proposal (2011}), the exclusivity rule was considered, in which a quotation present in one category cannot be in another, as well as the rule of homogeneity, which defines a category as having only one dimension in the analysis. Continue re-readings of the data revealed the "results" suggesting the main implications, challenges, and possibilities of climate change to the sustainable development of tourism.

4.1 Climate change: impacts and challenges for the development of Brazilian tourism

Recognizing the limitations of the knowledge on the relationship between tourism and climate change (^{Simpson et. al., 2008}; ^{Scott et al., 2009}; ^{Moreno, 2010}; ^{Grimm et al., 2013}), the results presented here are based on bibliometric and documentary research, and on the opinions and knowledge of the experts consulted.

Thus, when analyzing the potential magnitude of the effects of climate change on global tourism, research indicates significant impacts. However, the lack of long-term observations is a limiting factor in the diagnosis and quantification of the role of different agents of the climate in the tourism system (demand, supply, geographical space, and agents).

In the same way, the surveys carried out correspond to specific regions (islands and ski destinations) that are not relevant to tourism in Brazil. This could be justified by the fact that despite growing attention to the relationship between tourism and climate change since the 1990s the field remains relatively unexplored, mainly due to the lack of government investment in research on environmental and social dimensions of tourism. Another limiting factor is that the interdisciplinary studies related to the subject, even among those who play a relevant role in public policies and governmental institutions, still does not seem to be very expressive.

Notably, one of the basic characteristics of Brazilian tourism is the diversity and abundance of its resources, whose exploration resulted in uneven tourism development in terms of time and space, and the creation of numerous products, giving rise to regions with unequal and qualitatively distinct tourism development. These characteristics that identify the tourism product are directly related to the geographic setting, defined by its environmental components and its territorial function. Among the geographic features, the climate stands out, conferring peculiarity and diversity to each region, resulting in coastal, mountain, urban, and rural areas environments.

Based on these areas (coastal, mountain, urban, and rural), the aim was to identify the scenarios of climate change and its consequences for tourism in Brazil. However, the four areas presented a scale of analysis with some degree of abstraction that hides heterogeneities, specific problems, environmental contrasts, and climatic diversity. Therefore, these areas can be affected differently, since, besides the specific characteristics, the resources, products, and destinations are diverse and each has a different relationship with climate.

According to the nature and the scale of analysis carried out, the information from scientific studies, and the experts’ input, it was found that the most vulnerable areas are the coast and the mountain. The vulnerability to the impacts of climate change is not particular to Brazil. According to ^{Mello et al. (2009}), this situation also occurs in other world tourist destinations.

Drawing upon the experts’ contribu-tions, we identified the impacts, consequences, and challenges posed by climate change (Table 2) to the tourism industry. We highlight that the consequences can affect differently the various components of the tourism system: geographical space, demand, supply, and agents. Regarding the tourism system, the impacts can be expected from the increase in global temperature, reduction in precipitation, an increase in its interannual variability, increase in extreme climatic events, and sea-level rise.

Among the possible impacts of climate change on Brazilian tourism, ^{Coriolano (2015}) states:

(...) an emblematic example of the activity in the coastal zone of Ceará, where changes in the temperature of the planet according to the specialist can cause sea level to rise, and consequently increase flood events and aggravate beach erosion. In addition, the urban and tourist infrastructure located in the coastal zone can be damaged. An alternative to reduce the damage of these impacts may be the implementation of coastal engineering works, which, in turn can affect bathing waters and the scenic beauty of the coast (Expert consulted, 2015).

Other tourist destinations in Brazil may have some of their beaches affected, especially between the months of July and September, when the winds are stronger and the tides are higher. The advance of the sea is related to local effects (erosion, human activity, engineering, and occupation) and global warming. There are also temporal variations of sea level that can influence the numbers of long periods. Consequently, water invades and destroys coastal infrastructure (^{Marengo, 2007}; PBMC, 2014).

In the state of Paraná, the shore of Praia Grande (beach) in Matinhos is an example of coastal areas degraded by severe erosion, irregular occupation of the coast, rivers with waters probably contaminated by clandestine sewage connections, introduction of exotic species in the area of restinga (spit), execution of infrastructure works of leisure and access to the beach without criteria and with suppression of dunes and restinga, and constructions in publicly-owned property. Such conditions are not exclusively due to climate change, but this may exacerbate situations of coastal vulnerability due to heavy rains, rising sea levels, storms, and other phenomena that can greatly impact coastal communities and their productive activities.

Climate change is contributing to sea-level rise and causing storms resulting in sand-starved beaches, where the progressive scarcity of sand can cause some beaches in the Brazilian coast to disappear mainly in urban areas, which are at greater risk because sand is generally not replaced naturally and the shoreline suffers from great erosion. Moreover, rough sea with waves above three meters high and high tides will amplify these impacts throughout the coastal zone. There is also an occasional effect, which is the change in atmospheric circulation patterns, with changes in the wave regime (^{Rosman, 2007}).

On the other hand, milder tempera-tures in the south of the country can somehow favor beach tourism outside the summer period (Ambrizzi, 2015). Climate change scenarios for coastal tourism indicate that there may be a shift in the tourist season due to the intensification of a warmer and drier summer season. On the other hand, it may favor expansion and changes in the seasons. There may be a fragmentation of the working holiday period, to better take advantage of the atypical conditions of the weather (due to excess heat out of season) and better economic conditions (promotion of more affordable trips).

Warmer summers can indirectly enhance local economies through sales of weather-related products, e.g., to protect against ultraviolet rays (sunscreens, hats, glasses, etc.), and to relieve the heat (beverages, proper foods, ice creams, air conditioning, fans etc.), that become a basic need of both residents and tourists (^{Marengo, 2015}).

The climate projections, based on the Brazilian biomes, show that particularly in the North and part of the Northeast there will be a decrease in rainfall, causing a lack of water, while in the South there will be a significant increase in rainfall that can produce extreme flood events. For the Southeast, extreme rainfall and drought are observed, causing water shortage and floods that affect the population.

The scenarios show that the availability of potable water in the coastal zone may be further aggravated, a situation currently observed in some resorts, where the seasonal concentration of tourist demand requires supply alternatives. In this context, it is suggested, like other global tourist destinations, the desalination of seawater (Cape Verde, Africa), use of underground resources when they exist, and the use of rainwater (Palma de Mallorca, Spain). The solution to this question is key for the maintenance of coastal tourism activity, especially under climate change scenario.

In this context, we can observe the challenges tourism faces from the possible impacts of climate change. Economic, through new investments, technologies, and marketing strategies; environmental, with the protection and rational use of resources; social, promoting the reduction of poverty, the reduction of tourist vulnerability, ensuring physical security of the receiving community and tourists, in the event of an extreme climatic event; policy, promoting mitigation and adaptation actions and initiatives and; spatial, with proper planning and land use.

The impacts of climate change may also affect tourism demand directly, interfering with the choice of destination and the period of the trip, or indirectly affecting the quality of the experience, adverse perception after some extreme event and insecurity about the destination.

Extreme events are a growing concern for tourists in terms of security and protection, putting increasing pressure on planners and managers involved in tourism, urging them to analyze the impact of disasters on the sector and to develop strategies to deal with the adverse consequences (Maditinos & Vassiliadis, 2008; ^{Coriolano, 2015} - expert consulted).

Therefore, we verify that the tourism system is constantly adapting, responding to environmental, economic, political, demographic, and technological changes, to new demands, acting in a specific way according to the territory where the tourist destination is inserted. Therefore, Campos Filho (2015) emphasizes that:

(...) it is important to analyze the impacts taking a temporal and spatial scale and considering the characteristics of the site to be studied. In a macro scenario, climate change has impacted negatively all rural and urban environments, including vulnerable tourist destinations (current and potential) independent of biome and other geographic features (Expert consulted, 2015).

Therefore, regions with less precipitation should take measures to inform and educate tourists on using water wisely, promoting awareness on waste reduction. As for tourism enterprises, they should implement simple, effective, and environmentally friendly measures for water and energy use. Leisure activities or tourist destinations that depend on water (water parks, thermal baths, etc.) must pay attention to the need to diversify their activities. Likewise, tourist destinations that are vulnerable to the impacts of frequent heavy rains and its adverse effects (landslides, storms, floods, etc.) may have highways and airports affected causing delays or interrupting the movement of tourists. These destinations should be vigilant and get alert measures to anticipate the occurrence of winds, rainfall, lightning, and storms in order to take steps to ease the problem and protect the local population and tourists.

In suggesting that the tourism industry face the new challenges posed by climate change, we should consider the global/local relationship inherent to the phenomenon of climate change, and the possible articulation and actions of local movements with the international proposals on the subject. However, ^{Marengo (2015}) warns that despite the global/local articulation being possible, the cooperation between regional and global actions is advisable, since there is no point in reducing emissions locally if the "world continues to release greenhouse gases" (Expert consulted, 2015).

According to Ambrizzi (2015), a country must show the world it is doing its part in reducing GHG emissions and has a sustainable economic development. Maybe, as well, it can influence more decisively other Nations and thus be able to propose projects and topics toward consensus, including those countries that have not signed the global reduction agreement, under the Kyoto Protocol (Expert consulted, 2015).

For actions aimed at addressing the challenges posed by climate change to reach their goals and become benefits to the receiving communities, tourists and tourism companies will require partnerships among the various segments to legitimize actions and join efforts around common objectives. Recognizing this need ^{Redclift (2015}) bets on the collective and legitimate act of civil society: “There need to be specified links between individual and collective action and the need for strong community involvement. The key is the strength and legitimacy of civil society and its institutions” (Expert consulted, 2015).

Climate change poses challenges to tourism, however, it is possible to identify opportunities for the sustainable develop-ment of the activity by observing climate change scenarios, especially for destinations more vulnerable to extreme weather events, which may affect the life of communities, their assets, and ways of life, as well as tourism infrastructure and tourists themselves.

In this case, ^{Oliveira (2015}) states that the challenge that comes with pursuing opportunities "includes all economic activities, not just tourism. It is necessary to manage the changes that the ecological order will impose through the aggravation of environmental crisis" (Expert consulted, 2015). For Ambrizzi (2015) it will be possible to "(…) generate opportunities through the knowledge of how the climate will develop in the future. Warmer and drier regions, cooler and wetter can be adapted to develop environments conducive to tourism in the region" (Expert consulted, 2015).

Opportunities arise from change. The tourism industry should seize the moment to create conditions and develop a low-carbon economy.

4.2 Opportunity to develop a low-carbon tourism activity

On February 16, 2005, the Kyoto Protocol⁵ came into force, the document "The Economics of Climate Change," also known as the Stern Report (Stern Review on the Economics of Climate Change), emphasizes the business opportunity with the global warming and the production of agrofuel.

From this report, the term low-carbon economy⁶ becomes part of Government discourses. However, the current environmental crisis, makes it clear that it is not possible to reconcile growth with climate change; Although the prestigious ^{Stern Report (2006}) argues that "it's not incompatible the fight against climate change with the promotion of growth" (p. 39), this statement does not point the way toward this utopia.

As far as low-carbon economy is concerned we should highlight that using technology and processes less damaging to the environment are essential, however, this is not always a viable solution in the short term. According to Frangilli (2007), obtaining the so-called "carbon credits" is a new path companies and governments should consider carefully.

The Kyoto Protocol represents a global effort to mitigate climate change; the document states that developed countries, signatories to the agreement, should reduce their emissions by an average of 5 percent between 2008 and 2012, based on its 1990 emissions. It also established a mechanism that allowed emission reduction projects in developing countries that did not have emission reduction targets under the protocol, the Clean Development Mechanism (CDM). The CDM also helps countries with quantified GHG emissions limitation or reduction to achieve their commitments. That is, developed countries can meet part of their limitation and reduction targets for greenhouse gas emissions through the purchase of carbon credits generated in projects located in developing countries. Thus, countries like Brazil increase their chances of sustainable development. CDM projects should contem-plate replacement of fossil fuels, energy efficiency, burning or use of methane, among others. For the removal of carbon, methodologies for afforestation and reforestation were approved, where voluntary actions have been carried out in the context of the neutralization or compensation of emissions. However, caution should be exercised when using this type of measure, since there are many doubts about its real effectiveness (^{Frangialli, 2007}, p. 32).

^{Viola (2010}), assessing the advan-tages and disadvantages of Brazil in the transition to a low-carbon economy, highlights the importance of reflecting on the potential of the various sectors of the economy, as many demonstrate the potential and interest of their leaders in the transition to a low-economy carbon, among them the author emphasizes ecotourism.

Specifically, in the tourism sector, the low-carbon economy can be translated as the provision of lodging, transportation, food, and recreation services that meet the needs of the demand, that seeks a better quality of life of the local community and promotes the progressive reduction of the environmental impacts of services throughout the life cycle of the product. In other words, a low-carbon economy for tourism must enhance products with lower ecological impact, meeting the growing environmental awareness of consumers, and preserving the culture of host communities (^{Grimm, 2016}).

The initiatives for low-carbon tourism should involve the entire tourism system (demand, local population, private initiative, public authorities, and NGOs), promoting measures to address climate change in the short and medium term. Among the main objectives to achieve a low-carbon economy in the sector ^{Grimm (2016}, p. 66) highlights:

In the light of these principles, the tourism industry from the ecological efficiency (or eco-efficiency) outlook, presents itself as a perspective that can provide initiatives that are considered more sustainable.

Eco-efficiency is a term coined by the World Business Council for Sustainable Development, created in 1995, based on the life cycle of the product, whose analytical approach seeks to reduce the use of resources and minimize environmental impacts. It has been used mainly in the context of the industrial economy to reduce costs and create market opportunities while reducing the impact on the environment (^{Cramer, 2000}).

In tourism, eco-efficiency can help decision-making in carbon trading, however, ^{Gossling et al. (2005}) warn that some issues must be considered in applying the concept of eco-efficiency. Among them, the need to collect detailed data on transportation, accommodation, and leisure activities, as well as revenues generated for different markets. This can often prove to be difficult, but nonetheless, eco-efficiency can become a more widely used instrument for sustainable tourism (Gossling et al., 2005).

Also, destinations that are more vulnerable to extreme events (lack of water, heat waves, hurricanes, floods, landslides, sea level rise, etc.) should try to adapt to new environmental and climate scenarios. From this adaptation, new forms of tourism can emerge, such as community-based tourism, which seeks an alternative to mass tourism, favoring low environmental impact activities.

Developing countries, as suggested by the scenarios pointed out by the experts consulted, are the most vulnerable to the impacts of climate change and those least able to cope with them. Thus, efforts to expand research and production of knowledge that can help decision-makers in planning and creating public policies that include the tourism industry in approaches to climate change, become essential.