PARIS (AFP) - A third of humanity, mostly in Africa and South Asia, face the biggest risks from climate change but rich nations in northern Europe will be least exposed, according to a report released Wednesday. Bangladesh, India and the Democratic Republic of Congo (DRC) are among 30 countries with extreme exposure to climate shift, according to a ranking of 193 nations by Maplecroft, a British firm specialising in risk analysis. Five Southeast Asian nations Indonesia, Myanmar, Vietnam, the Philippines and Cambodia are also in the highest category, partly because of rising seas and increasing severe tropical storms. Maplecrofts tool, the Climate Change Vulnerability Index (CCVI), looks at exposure to extreme weather events such as drought, cyclones, wildfires and storm surges, which translate into water stress, loss of crops and land lost to the sea. How vulnerable a society is to these events is also measured, along with a countrys potential to adapt to future climate change-related hazards. Of 30 nations identified in the new report as at extreme risk from climate change, two-thirds are in Africa and all are developing countries. Africa is especially exposed to drought, severe flooding and wildfires, the report says. Many countries there are particularly vulnerable to even relatively low exposure to climate events, said Charlie Beldon, co-author of the study. Weak economies, inadequate healthcare and corrupt governance also leave little margin for absorbing climate impacts. At the other end of the spectrum, Iceland, Finland, Ireland, Sweden and Estonia top the list of nations deemed to be least at risk. With the exception of Israel and oil-rich Qatar and Bahrain, the 20 least vulnerable countries are in northern and central Europe. China and the United States the worlds No. 1 and No. 2 carbon emitters are in the medium and low risk categories, respectively. In a parallel analysis of major cities at risk, Maplecroft pointed to Dhaka, Addis Ababa, Manila, Calcutta and the Bangladesh city of Chittagong as being most exposed. Three other Indian metropolitan areas Chennai, Mumbai and New Delhi were listed as being at high risk.