IN AMERICA, THE world's largest economy and its second biggest polluter, climate change is becoming hard to ignore. Extreme weather has grown more frequent. In November wildfires scorched California; last week Chicago was colder than parts of Mars. Scientists are sounding the alarm more urgently and people have noticed-73% of Americans polled by Yale University late last year said that climate change is real. The left of the Democratic Party wants to put a "Green New Deal" at the heart of the election in 2020. As expectations shift, the private sector is showing signs of adapting. Last year around 20 coal mines shut. Fund managers are prodding firms to become greener. Warren Buffett, no sucker for fads, is staking $3obn on clean energy and Elon Musk plans to fill America's highways with electric cars.
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