New Delhi, Aug. 14 -- There is arguably no catastrophe that the world has collectively faced as severe as the effects of global warming, besides the threat of nuclear war. Amid floods in the Himalayas and forest fires in California and Spain, and the attendant droughts and displacement of people, it is hard to find any good news.

This summer, the distressing headlines of flash floods and inclement weather in and around Himalayan destinations have been like a chronicle foretold of the worst of climate change. But last week, a survey of 6,000 travellers by the European Travel Commission found that 75% of those surveyed said climate change had made them alter the way they travel.

The silver lining is that it might yet lead to less congeste...