All nations will suffer the effects of a world 4C hotter, but it is the world's poorest countries that will be hit hardest by food shortages, rising sea levels, cyclones and drought, the World Bank said in a report published on Monday on climate change.
Under the new World Bank president, Jim Yong Kim, the global development lender has launched a more aggressive stance to integrate climate change into development.
"We will never end poverty if we don't tackle climate change. It is one of the single biggest challenges to social justice today," Kim told reporters on a conference call on Friday.
The report, called Turn Down the Heat, highlights the devastating impact of a world hotter by 4C by the end of the century, a likely scenario under current policies, it said.
Climate change is already having an effect: Arctic sea ice reached a record minimum in September, and extreme heat waves and drought in the last decade have hit places like the United States and Russia more often than would be expected from historical records, the report said.