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effort to measure the extent to which countries provide for the non-economic needs of their citizens.

to understand what’s really going on, the climate jigsaw puzzle needs to be complete. That, says climate scientist Gavin Schmidt, is where climate modeling comes in. The discipline synthesizes data from multiple sources, including satellites, weather stations, even from people camping in the Arctic and submitting measurements of the ice they see around them. Climate modeling, Schmidt says, gives us our best chance of understanding the bigger picture of the world around us. “We take all of the things we can see are going on, put them together with our best estimates of how processes work, and then see if we can understand and explain the emergent properties of climate systems,” he says. These four silent animations show what he means.

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.