2.1 Grasslands ecosystem, climate change impact, and adaptation
Of the various agro-ecological or forest systems, grasslands constitute 53,544 sq Km which is close to a range of 20–40% of the global landmass and as per another estimate 26% of the global landmass with sub-saharan Africa and Asia accounting for the maximum share with14.500 sq Km and 8.900 sq Km respectively (WRI 2000, Kemp et al 2012,). Globally, grasslands provide employment opportunities to over 800 million people for livestock and forage (Leisher et al 2012). Defining a grassland has not been an easy task for ecologists, classifying attempts have been on the degrees of vegetation and/or animal presence or the physical parameters; one accepted definition is a piece of land constituting less than 10 percent tree cover (WRI 2000, Dixon et al 2014). Grasslands are characterized as tropical and subtropical savannas, steppes, prairie, shrubland, mediterranean shrubland, temperate grasslands, savannahs, and tundra (Singh et al 1983, WRI 2000, Allen et al 2011, Rawat and Adhikari 2015). Considering their ecological role and services, source of bioenergy, and importance in conservation of biodiversity, a new framework for classification, distribution has been suggested in the work of Dixon et al (2014). In order to channel resources towards conservation and management of grasslands-the sub parameters include non-wetland formation with vascular vegetation, graminoides forming at least 10% and 25%, shrubs and trees cover less than 25% and 10% (Dixon et al 2014). Presence of few common grasses over a wide range of geographies is associated with either invasiveness or adaptability (Singh et al 1983). Over the years, few of the grasses belonging to poaceae have evolved as agrarian crops in the present day like rice, rye, sorghum, maize originated as Grassland crops (WRI 2000). In India, 50% of animals are dependent on grasslands (Roy and Singh 2013).
Climate change impacts over 15 million years of grassland distribution with C4 grasses in the tropical grassland ecosystem (Hall and Scurlock 1991, Ravindranath and Gadgil 1998, Dixon et al 2014). Apart from industrial sources, anthropogenic factors contributing to climate change have been highlighted for natural systems (Hill et al 2001, Roxy et al 2017, Adve 2019, Gibson and Newman 2019). Anthropogenic conversion of grasslands is a source of methane and nitrous oxide, such as in temperate grasslands where in grassland to cropland and pasture land contributes to an estimated 20% emissions (Noble 1993, WRI 2000, Hopkins and Prado 2007). The ecological changes are measured using parameters such as changes in desertification, fire incidents, net primary productivity, localized loss of native species in numbers and threat to their existence, imbalance in prey-predator availability leading to change in niche and foraging habits, widespread species loss throughout the century (UNEP 2020). This is understood vis-a-vis climate change, continued heat and water stress due to warmer temperature, increased summer drought, heat waves; erratic rainfall, floods, droughts, and wildfires with varying degrees and impacts for these agro-ecological ecosystems across agro-climatic zones of various countries (Noble 1993, Ravindranath and Sukumar, 1998, WRI 2000). Similar to the case of agricultural crops, there are reports of enhanced production in grasslands of Europe but with threats of increased fragmentation, land use changes, invasive species, agricultural intensification, and species loss, productivity concerns, and irrigation concerns, shifts in balance among functional groups cannot be ignored (Hopkins and Prado 2007, Gibson and Newman 2019). Grasslands are home to some majestic species and vegetation in India. The varieties of grasses found in the Indian subcontinent within protected or unprotected areas in India have been carefully tended to attract conservation efforts towards their protection and simultaneously protection of their grassland habitat (Singh 1983, Hopkins and Prado 2007). The sustenance of grasslands is important for the communities dependent on them for source of livelihood, passage, socio-cultural or traditional knowledge (Roy and Singh 1993). Conservation of grasslands is essential to support flora and fauna it represents, to act as carbon sink, for nutrient availability, cycling, uptake, utilization, and overall health of the ecosystem (Noble 1993, Ogle et al 2004). Grasslands provide niche habitat to support tourism, recreation, and livelihoods (Ogle et al 2004). Climate science adaptation is an extension of climate impacts and climate assessments. This is supported by persistent climate change dialogue which has attracted finance for scientific research, environment, and social action. Grasslands, wetlands, and grasslands wetlands ecotones occupy close to 2.57 million square kilometers on the earth surface. They are unique ecosystem, support biodiversity, and provide ecosystem services inclusive of local livelihoods. When it comes to grasslands, wetlands, climate change effects are quantified using metrics like biomass yield, species diversity, population, food chain, and food network within ecosystems. Critical ecological concern due to climate change point of view includes succession, plant species establishment, habitat health, and ecosystem functioning in understanding climate change for an ecological system such as ecotones.
2.2 Wetland ecosystem-ecology impacted by climate change
Climate change poses a significant threat to wetlands, which play a vital role in protecting biodiversity (Hale et al 2016). Recognition of this led to the creation of the Ramsar Convention in 1971, an international treaty for the conservation and sustainable use of wetlands (Bhatta et al 2016). To date, there are 2,492 Ramsar sites have been designated in 172 countries, covering an area of 2.56 million square kilometers (Ramsar Convention, 2021). According to the convention, wetlands are defined as areas consisting of a range of non-grass species, such as marshes, peatlands, fens, or water bodies, whether natural or artificial, permanent, or temporary, flowing or static, fresh or brackish or salt, including marine water depths of which do not exceed six meters (Bhatta et al 2016). In India, there are 75 Ramsar wetland sites, with the oldest being Chilika lake, declared in 1981, and recent additions including Tso Kar and Asan in Ladakh, Jammu and Kashmir, and Uttarakhand, respectively (Ramsar Convention, 2021). Wetlands serve a variety of important functions, including wave attenuation, ecosystem management, shoreline protection, marine nutrient cycling, geomorphology, and the prevention of erosion damage (Pecl and Jackson 2007, Gedan et al 2011, Hale et al 2016). They also support fisheries and invertebrates population distribution, provide livelihood, and tourism opportunities (Gedan et al., 2011), and have aesthetic and cultural value (Badola and Hussain 2005). Coastal wetlands, such as mangrove forests, also play a critical role in mitigating the effects of climate change (Gedan et al 2011). Studies have suggested that mature mangrove forests can tolerate wind speeds of up to 150 km/h (93 mph) and that mangroves can withstand wind speeds of up to 120 km/h (75 mph) (Gedan et al 2011). These ecosystems provide important services and are sensitive to upland-marshland changes as ecotones (Wasson 2013). Mangroves not only maintain ecosystem health, but they also provide livelihood opportunities to the local population and support climate resilience (Badola and Hussain, 2005). Therefore, it is essential to implement conservation measures to protect and sustain wetlands as they play a critical role in mitigating the impacts of climate change and preserving biodiversity (Hale et al 2016, Gedan et al 2011, Pecl and Jackson 2007, Badola and Hussain 2005). Hence, working with communities for adaptation strategies is co-current to contemporary climate change challenges in wetland ecosystem.
2.3 Nature based solutions for grassland-wetland ecotone
An ecotone is a gradient between two ecosystems distinguished by predominant plant communities, it can also be explained like a transition between two distinct species of plants for example in the case of grasslands and wetlands, the Poaceae family dominates the grassland ecosystem whereas the non grass family or non graminoides dominate the wetland species, it is also a transition in terms of habitat, a grassland is a complete terrestrial habitat whereas wetland constitute a water based medium for diversity either stagnant or flowing and leads to more often than not ocean or marine ecosystem. However, it would be a misnomer to think of wetlands acting always as a transition between land and ocean as there are wetland locked in the middle of a landmass and are fresh water based wetland like the Wular lake in Jammu and Kashmir, India. When it comes to studying these ecotones, with respect to climate science apart from traditional tool of measuring habitat and ecosystem health, remote sensing, Geographic Information System and more recently Google earth engine are proving to be useful tool to study, analyze, and recommend strategies to better mitigate, adapt and be more climate resilient (Dixon et al 2014). The traditional ecological tools used to highlight reasons, impacts, and studies enumerating threats to either a single species or the management of species, population distribution, communities, protected area and bio-geographies due to changing climate are done through time series data, biomass yield, species enumeration and inventory (Hale et al 2016). The remote sensing methods have been used to highlight spatial distribution of vegetation pattern, and is useful for juxtaposing current and past distribution of the grassland landscape in terms of energy flow, hydrology, ecosystem services, and disturbance regime providing a bird eye view to ecologists doing conceptual and field work either closely with a species or within a fragment or multiple fragment of the ecosystems and have gained popularity in semblance with their application in multiple fields for (Dixon et al 2014). In order to extend and adapt to the importance of socio-cultural or socio-ecological values associated with such landscapes, it would be interesting to see the dependent livelihood, their approach towards climate adaptation, if any recognized through traditional knowledge systems or through modern sources of livelihood.
Nature based solutions are defined as, “Wide range of protection and management of natural and semi-natural ecosystems, the incorporation of green and blue infrastructure in urban areas, and the application of ecosystem based principles to agricultural systems” (Seddon 2020). Agriculture and agriculture allied fields such as fisheries, livestock, sericulture, apiculture, poultry, and non-timber fuelwood are a source of income generation for the local communities. Another way of looking at these activities is to see their source which is nature and their generation is through natural functions, interlinkages, interaction, activities within an ecosystem and outside of an ecosystem. Through this we are trying to imply the creation of recognized sources of income generation or livelihood are based on nature and natural services which have been in ecological parlance coined as ecosystem services. Ecosystem services, the term coined by Ehrlich and Ehrlich (1981) are identified as provisioning, regulating, cultural, and supporting. The conceptual importance of ecosystem services lies in the association of the sustenance or generation of livelihood in and around a natural habitat. These sustenance supportive activities or ecosystem services are threatened due to lack of conservation efforts in a diversity rich area or neglected habitats such as grasslands and wetlands (Ehrlich and Mooney 1983). The ecosystem services and associated livelihood threatened by climate change in grasslands and wetlands could be negated by nature based solution (Gibson and Newman 2019).
2.4 Management practices, livelihood-market mechanisms, and finance for nature climate solutions
Nature-based solutions (NBS) for climate change adaptation, such as managing ecotones through habitat restoration and conservation, have been recognized as a sustainable response to climate vulnerabilities and as nature climate solutions (Seddon 2019). Effective management practices, livelihood-market mechanisms, and finance are crucial for implementing and scaling up nature climate solutions. Effective management practices include monitoring and evaluation systems to assess the effectiveness of nature climate solution as well as adaptive management approaches that allow for adjustments to be made as conditions change (Bhatta et al 2016). Livelihood-market mechanisms can include payments for ecosystem services, in which landowners are compensated for the benefits that their ecosystems provide to others, or the development of markets for products derived from sustainably managed ecosystems (Hunter 2007). These mechanisms can ensure that the implementation of nature climate solutions is inclusive and equitable, and that local communities are able to benefit from them.
Finance for nature climate solutions can come from a variety of sources, including government funding, private sector investments, and international climate finance (UNEP 2020, UNCCD 2021). It is important to ensure that finance is directed towards projects that are sustainable, equitable, and based on the participation of local communities. Financial instruments for nature climate solution can include: pollinator conservation, farm subsidies, fisheries and assisted colonization (Hunter 2007). The potential of NBS has been highlighted by the World Business Council for Sustainable Development and the Nature for Climate (WBCSD and N4C 2019) who have stated adaptation strategies could reduce greenhouse gas emissions by a third by 2030. The potential of nature climate solutions can be unlocked by involving local communities and enhancing their livelihoods, improving the natural aesthetics of the area and providing benefits for human health and carbon tradeoffs (Weiskopf 2021). Thus, solutions or adaptation strategies for managing ecotones have a significant potential to be a sustainable response to climate vulnerabilities by reducing greenhouse gas emissions, improving livelihoods, and providing opportunities for carbon sequestration. Effective management practices, livelihood-market mechanisms, and finance enable implementation and scaling up of these solutions (Hunter 2007). The involvement of local communities, the use of financial instruments and the consideration of ecosystem connectivity are crucial factors for the successful implementation of these solutions (Bhatta et al 2016). The findings of this study underscore the importance of investing in adaptation strategies as a means to address climate change, and the need for continued research to better understand the potential of climate solutions and how to effectively implement them.
The international directives such as Sustainable Development Goals, Aichi Targets call for diversion of policy instruments for conservation (Seddon 2019). Realization of non technical solutions and economic instruments to support addressing climate change is a result of interdisciplinary or political ecology approach (Myers et al 2021). The 2020–2030 decade of restoration requires innovative and environment friendly measures for land use change to support lives and livelihood. Innovativeness here implies novel economic approaches for the cost involved for 47% of degraded dry land for land use management (UNCCD 2022). Nature based solutions addressing natural and societal change as conservation measures are non technical solutions for combating climate change or desertification (Lin et al 2021, UNCCD 2022). Land use management and economic approaches are important tools for designing projects for nature based solutions. Inclusive, collaborative, objective oriented practices are encouraged in nature based solutions (Myers et al 2021). Provision for livelihood and nature climate solutions shift in economic approaches, thinking for conservation efforts, deviating from poverty or development based models where necessary as in the case of sustainability (Ehrlich and Ehrlich 1981, Daly 1990, Weiskopf 2021). Fashioning an economic instrument for conservation such as use of microfinance, incentives, and subsidies in supply livelihood chains along the conservative source of funds could ensure monetary benefits for the local communities.
2.5 Climate policy implications for grassland, wetland, and grassland-wetland ecotone
The policy implications of climate change are crucial for international relations, diplomatic ties, finance for nature, and in doing so it cuts across the sustainability paradigm (Metz 2000, Hall, 2016, Fawzy et al, 2020, Lin et al 2021). Starting from the establishment of the World climate conference in 1979, IPCC in 1988, Brundtland commission report in 1987, Hague declaration mobilizing 22 heads of state on the issue of climate change, second world climate conference in 1990 bringing the discussion to countries to reduce CO2 emissions by 20% by 2005, Paris agreement with 197 countries seeking to limit the rise in global temperature within 2 degree Celsius and preferably below 1.5 degree Celsius, Kyoto protocol and UNFCCC in 1992 are all a result of multilateral consensus for climate change negotiations (Gupta 2010). The scientific collaboration for climate change is possible through platforms like Inter Academy Panel on International Issues (IAP) with over a hundred national science academies working on ocean acidification and deforestation, influencing climate policy and science diplomacy (Turkeian et al 2015) which is an important global medium of participation towards climate action. These multilateral conversations and agreements have evolved with change in paradigm of climate change from pre 1990’s to the current times, seen as an environmental issue to that of a developmental issue, political issue and also in the context of economic fall back during recession (Gupta 2010). In recent years there has been a change in approach to address climate change from mitigation measures to that of adaptation measures at the global scale (WRI 2020). The evolution in global outlook towards understanding climate sciences, where the issues of climate negotiation fit within the global negotiation for politics, trade, ties but also determine the allocation of finance to just, simple solutions, towards climate action. In doing so, they also provide an umbrella network to issues of livelihood, cultural, and social knowledge and belief systems to sustain biodiversity, promote sustainability, and enhance climate resilience. At present, climate studies require modified laws, institutional arrangements or directives for data management for UN climate change negotiations at national levels such as to support the meteorological data trends collected within the last 50 years with over 500 meteorological weather stations in India itself (Rathore et al 2013, IPCC 2019). As policy concerns related to climate change are increasing, it is imperative to match our conceptual understanding, conservation strategies, the requisite finance and policy tools with that of present and increasing concerns (Cohen 1993). It is recommended to employ a variety of policy tools in addition to spatial studies in order to channelize finance towards nature and nature based solutions for climate change (Wilby 2007, World Bank 2021).
In India, apart from institutional framework and strengthening the state level climate action plan and developing indicator framework for monitoring climate vulnerability in India, trans-disciplinary application could be beneficial for improving the efficacy of climate change in ecological systems (Climate vulnerability report 2019). The process of conducting interdisciplinary research within climate sciences could very well be applied for ecological concerns and direct finances towards solutions which support ecosystem approach. The synergies with ecological economics, socio-ecology, and political ecology under the lens of sustainability add to climate change policy and practice within ecology using the transdisciplinary approach applied for equitable future (Bergmann et al 2005, Krellenberg and Katrin 2014, Gaziulusoy et al 2016, Jayaraman and Kanitakar 2019). This would ensure cognizance of improved measures and recommendations for long term eco-tone management for climate change adaptation at global and local level (Planning commission 2006, Klenk and Meehan 2015, Sivapalan et al 2021). There is continued scope for improved understanding within biota of Antarctic glaciers, to anthropogenic involvement, nature based solutions and mitigation based on the principles of equity (Clarke et al 2007, Jayraman and Kanitkar 2019). The nature based solution for climate adaptation strategies and measures for localized implementation has gaps to be addressed through research, innovative measures, and stakeholder engagement for climate impacts and livelihood integration in case of India and perhaps similar developing countries as shown in Fig. 1.