A new study indicates that global warming has already approached a crucial, solid human survivability limit, decades earlier than the earlier estimate. The analysis revealed that places like Jacobabad in Pakistan and Ras al Khaimah in the United Arab Emirates have both repeatedly crossed a deadly threshold for one or two hours at a time. Scientists from the US-UK  examined surface temperature data around the world on land and sea and found that the frequency of wet-bulb temperatures exceeding temperatures between 27°C TW and 35°C TW had all doubled since 1979. This study implies that, at the local and regional scale, climate changes can be more extreme than global averages propose, and have more severe consequences.