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Significant advances in the implementation of climate services in South America have occurred in response to the challenge proposed by World Meteorological Organization (WMO) in 2009 to expand and strengthen such climate services aimed at the public in general and key socioeconomic sectors, in particular. An evaluation of these advances, as well as their achievements, limitations, and own challenges is presented. The approach of this evaluation is based on the analysis of a representative set of climate services experiences in the region. In general, South America has made considerable progress in conducting initiatives that operationally provide climate monitoring and prediction information, such as the WMO regional climate centers. There are also promising experiences of climate services in some regions and countries, aimed at sectors such as agriculture, water, and disaster risk management, among others. Likewise, the levels of climate predictability existing in various regions of the continent have allowed the development of regional seasonal prediction tools, which, in some cases, have been integrated with information on non-climatic factors to provide guidance oriented to specific sectors. Also, participatory frameworks engaging the different actors involved, including frameworks based on co-production strategies, ensure stronger appropriation of climate services by decision makers. Successful examples include the development of agro-climatic predictions to support decision-making and agricultural practices, hydroclimatic predictions to make decisions related to the generation and provision of electrical energy, and monitoring and prediction tools to prevent the vector-borne diseases. However, a good portion of these efforts focuses mainly on the provision of climate services and not enough on their actual use. On the other hand, most efforts are under development and implementation through short- or medium-term projects. Therefore, the strengthening and growth of climate services in South America require the consolidation and expansion of not only the regional monitoring and prediction capacities, but also of the personnel and resources of the participating institutions in continuous linkage with the users.

High mountains (i.e., mountains that reach above the climatic treeline) are regions where many interests converge. Their treeless alpine landscapes and ecosystems are key areas for biodiversity, they act as water sources and reservoirs, and they are cultural and religious icons. Yet, mountain environments are threatened by global stressors such as land use impacts and anthropogenic climate change, including associated species redistributions and invasions. High mountains are warming faster than lower elevations. The number of frost days is declining, glaciers are retreating, and snow is remaining for shorter periods, while CO2 partial pressure is increasing. All of these factors affect the way in which ecosystems prosper or degrade. Thanks to the compression of thermal belts and to topographic ruggedness that favors habitat heterogeneity, mountains have a high diversity of biotic communities and species richness at the landscape level. In tropical to temperature regions, high mountains are biogeographically much like islands. With small habitat areas, species tend to be distributed patchily, with populations evolving independently from those on other isolated summits. Although high mountain areas strongly differ in size, geological age, bedrock, glacial history, solar radiation, precipitation patterns, wind exposure, length of growing season, and biotic features, they are all governed by low-temperature conditions. Combined with their distribution over all climate zones on Earth, mountain habitats and their biota, therefore, represent an excellent natural indicator system for tracing the ecological impacts of global climate change. As temperatures rise, plants and animals migrate upward (and poleward). Plant and animal populations on small, isolated mountains have nowhere to go if climates warm and push them upslope. On the other hand, habitat heterogeneity may buffer against biodiversity losses by providing a multitude of potential refugia for species which become increasingly maladapted to their present habitats. Global-scale approaches to monitor climate and biotic change in high mountains as well as modeling and experimental studies are helping explain the nature of these changes. Such studies have found that species from lower elevations are colonizing habitats on mountain summits at an accelerating pace, with five times faster rates than half a century ago. Further, repeated in situ surveys in permanent plots showed a widespread transformation of alpine plant community assemblages toward more warmth-demanding and/or less cold-adapted species. Concurrently to widespread increases in overall species richness, high-elevation plant species have declined in abundance and frequency. Strongly cold-adapted plant species may directly suffer from warmer and longer growing seasons through weak abilities to adjust respiration rates to warmer conditions. Combined effects of warming and decreasing water availability will amplify detrimental effects of climatic stresses on alpine biota. Many of the dwarf and slow-growing species, however, will be affected when taller and faster-growing species from lower elevations invade and prosper with warming in alpine environments and, thus, threaten to outcompete locally established species. Warming conditions will also encourage land use changes and upward movement of agriculture, while loss of snow is a loss to ski fields and scenic tourism.