By T. R. Ramachandran and T. R. Shankar Raman (This article appeared as a lead on the edit page of The Hindu on 13 July 2013) The recent flood-related disaster in Uttarakhand was labelled a Himalayan tsunami, recalling the deaths, damage, and destruction that followed the Indian Ocean earthquake and tsunami of December 2004. Yet, this is a misleading metaphor, because there is little evidence that real tsunamis are linked to human activities that impact our oceans or sea-floors. In contrast, there is compelling evidence that climate change and the occurrence of extreme meteorological events—such as the one in Uttarakhand—are also related to human activities that have altered our atmosphere through greenhouse gas emissions. In today’s world, many weather-related disasters are not merely chance occurrences. Extreme weather and related disasters are becoming more common. In an analysis published in 2012, Munich Re, the global insurance giant, reported that disasters tied to extreme weather events have more than doubled worldwide since 1980. So far in 2013, many examples stand out—record high temperatures in Australia and the …