Agence France-Presse: Nations should throw themselves into building defences against floods and drought, which may already be multiplying due to climate change, the World Water Forum here heard on Tuesday. The biggest-ever gathering on tackling the world’s water crisis was warned that water-related catastrophes are more frequent and more brutal, inflicting a rising toll in lives and damage, and greenhouse gases are fingered as a cause. "Global warming is intensifying these disasters," said Avinash …