"Officially this year, there have been 63 #HeatDeaths in Thailand, at least 143 in India, at least 172 in Mexico, and more than 1,300 in a single week during the Hajj pilgrimage in Saudi Arabia. But unofficially, these numbers are a fraction of heat’s true toll. They are often the most obvious cases and are much less likely to account for fatalities in which temperatures played an indirect role."