Almost every conversation during London Climate Action Week began and ended with one topic: the scorching, record-breaking heat . Londoners complained with good reason about everything from the sleepless nights trying to catch a breeze to the heat-related school cancellations that kept kids home. Americans in the crowd agreed among themselves that heat isn’t the problem; the pervasive lack of air conditioning is. And yet through drenched shirts and heat-induced train delays, some 100,000 people