Part two of Praveen Gupta's interview with Rob de Laet, on Punjab's aquifers, heat in Lucknow, Kerala's floods and Himalayan snow. Local solutions in specific places, not general theory.

Rainforests do not merely absorb carbon. Through transpiration and the clouds it forms, a closed canopy cools the surface beneath it by around half, and Peter Bunyard argues that restoring the world's forests could offset as much global warming as we now suffer.