By John Schwartz
By just about any measure, the movement to battle climate change has grown so large that the truths of Al Gore’s decade-old movie now seem more mainstream than inconvenient.
In Paris in December, 195 nations agreed to reduce greenhouse gases. In the United States, 70 percent of Americans say that climate change is real. Pope Francis has joined the call for action. Hundreds of thousands of people have come together for climate marches in Paris and New York, and demonstrators recently held fossil-fuel protests on six continents.
“That’s what I call momentum,” Daniel R. Tishman, the chairman of the board of the Natural Resources Defense Council, said in its recent annual report. “This isn’t just the wind at our backs; these are the winds of change.”
But the movement that started with a straightforward mission — to get more people to appreciate the dangers of climate change as a precursor to action — is feeling growing pains. What may seem like a unified front has pronounced schisms, with conflicting opinions on many issues, including nuclear power and natural gas, that are complicating what it means to be an environmentalist in this day and age.
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