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Sixty nations committed on Tuesday to improve the efficiency of new air-conditioners by 50 percent and reduce greenhouse gas emissions related to those cooling machines by almost 70 percent, the latest in a flurry of global promises that aim to tackle climate change. The voluntary pledge made at the U.N. climate talks in Dubai was …
With nearly 10 million people expected to throng the streets of Paris during the Olympics this summer, visitors already knew getting around the city would be a challenge. But now it will probably be a lot more expensive, too. The price of a single ride on the Metro between July 20 and Sept. 8, roughly …