More frequent and longer-lasting droughts caused by rising global temperatures pose significant risks to people and ecosystems around the world — according to new research. The paper has quantified the projected impacts of alternative levels of global warming upon the probability and length of severe drought in the six countries.More frequent and longer-lasting droughts caused by rising global temperatures pose significant risks to people and ecosystems around the world — according to new research. The paper has quantified the projected impacts of alternative levels of global warming upon the probability and length of severe drought in the six countries.