“There is increasing recognition of the value of social, institutional, and ecosystem-based measures and of the extent of constraints to adaptation”: IPCC
The language is clear and blunt. The message continues to be, as it was in 2013 September, that our societies must change urgently and dramatically. The evidence marshalled is, when compared with the last assessment report of 2007, mountainous and all of it points directly at the continuing neglect of our societies to use less and use wisely.
This Fifth Assessment Report (AR5) by the Intergovernmental Panel on Climate Change (IPCC) comes seven years after the last. It has said that observed impacts of climate change have already affected agriculture, human health, ecosystems on land and in the oceans, water supplies, and livelihoods. These impacts are occurring from the tropics to the poles, from small islands to large continents, and from the wealthiest countries to the poorest.
“Climate change has negatively affected wheat and maize yields for many regions and in the global aggregate. Effects on rice and soybean yield have been smaller in major production regions and globally, with a median change of zero across all available data, which are fewer for soy compared to the other crops. Observed impacts relate mainly to production aspects of food security rather than access or other components of food security. Since AR4, several periods of rapid food and cereal price increases following climate extremes in key producing regions indicate a sensitivity of current markets to climate extremes among other factors.”
Widespread impacts in a changing world. Global patterns of impacts in recent decades attributed to climate change. Impacts are shown at a range of geographic scales. Symbols indicate categories of attributed impacts, the relative contribution of climate change (major or minor) to the observed impact, and confidence in attribution. Graphic: IPCC
The IPCC’s Fifth Assessment Report (AR5) contains contributions from three Working Groups. Working Group I assesses the physical science basis of climate change. Working Group II assesses impacts, adaptation, and vulnerability, while Working Group III assesses the mitigation of climate change. The Synthesis Report draws on the assessments made by all three Working Groups.
The Working Group II AR5 considers the vulnerability and exposure of human and natural systems, the observed impacts and future risks of climate change, and the potential for and limits to adaptation. The chapters of the report assess risks and opportunities for societies, economies, and ecosystems around the world.
“Differences in vulnerability and exposure arise from non-climatic factors and from multidimensional inequalities often produced by uneven development processes. These differences shape differential risks from climate change. People who are socially, economically, culturally, politically, institutionally, or otherwise marginalised are especially vulnerable to climate change and also to some adaptation and mitigation responses. This heightened vulnerability is rarely due to a single cause. Rather, it is the product of intersecting social processes that result in inequalities in socioeconomic status and income, as well as in exposure. Such social processes include, for example, discrimination on the basis of gender, class, ethnicity, age, and (dis)ability.”
The Working Group 2 report has said that impacts from recent climate-related extremes (such as heat waves, droughts, floods, cyclones, and wildfires) reveal significant vulnerability and exposure of some ecosystems and many human systems to current climate variability. The impacts of such climate-related extremes include alteration of ecosystems, disruption of food production and water supply, damage to infrastructure and settlements, morbidity and mortality, and consequences for mental health and human well-being. The WG2 has starkly said that for countries at all levels of development, these impacts are consistent with a significant lack of preparedness for current climate variability in some sectors.