Sir — This refers to the article, “Ensure safe drinking water for all” (May 6) by KP Shashidharan. The matter of safe drinking water needs urgent attention. Imagine, more than two billion poor people are drinking unprocessed water and facing untold diseases. It is good that the UN is seized of the problem. India has only four per cent of the world’s renewable water resources but more than 16 per cent of the world’s population. Concrete measures need to be taken to ensure safe drinking water for people all over the world in the long term.