Throwing shade: a farmer burns paddy husks in Chandigarh, India, October 2003.
KAMAL KISHORE / REUTERS

After dithering for decades, governments finally seem to be paying serious attention to the problem of global climate change. Late last year, at the Paris climate conference, they adopted a major new agreement to limit global warming, beginning a process to strengthen commitments to reduce greenhouse gas emissions over time. For many observers, the promises of the Paris conference offer too little, too late, because emissions are high and still rising and because there will be major disruptions to the climate even if countries meet their emissions-reduction pledges. Nevertheless, it had been 18 years since the world’s governments left a

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