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Nearly 54 percent of the country’s 1.35 billion people now live in cities, up from less than 18 percent in 1978.

more work to do to make sure its ideas are designed and carried out in ways that benefit its people.

Taken alone, the small-scale transformation in my yard doesn’t matter all that much. But a constellation of small patches of milkweed, connecting one neighborhood to the next, might mean the difference between life and death for the monarchs. We need to start thinking not just about what used to be, but what could be. It’s going to take a lot of work. But it sure beats despair. The author of “My Backyard Jungle: The Adventures of an Urban Wildlife Lover Who Turned His Yard Into Habitat and Learned to Live With It,” and an associate professor of creative writing at the University of South Carolina.

tate-owned news outlets reported this month that the government would ban the use of coal in Beijing and other urban areas by 2020 in an effort to reduce the noxious air pollution that chokes many cities. In July, a Chinese academic who is also a senior lawmaker said the government was considering a national cap on coal use as soon as 2016.

But he and other officials have provided few details — and, indeed, have sent conflicting, even disturbing, signals about their plans. Some measures China is considering could actually exacerbate climate change. One particularly misguided plan, for instance, would involve building 50 large industrial facilities in western China to convert coal into synthetic natural gas.