Climate vulnerability has been quantified in the Climate Vulnerability Monitor reports of 2010 and 2012. Climate vulnerability in developing countries occurs in four impact areas: health, extreme weather, habitat loss, and economic stress. A report by the Climate Vulnerability Monitor in 2012 estimated that climate change causes 400,000 deaths on average each year, mainly due to hunger and communicable diseases in developing countries. These effects are most severe for the world's poorest countries. Internationally there is recognition of the mismatch between those that have caused climate change and those which will suffer the most from climate change, termed "climate justice". It has been a topic for discussion at some of the United Nations Climate Change Conferences (COP).