Climate change
Why it’s a problem: Greenhouse-gas emissions concentrating in the atmosphere are on pace to heat the planet, pushing up sea levels and likely increasing weather extremes such as droughts and floods. The results would wreak havoc on crops and water supplies, and force millions of people to migrate.
How bad it could get: Under a low-risk, high-impact scenario, the climate could change very rapidly, wiping out food supplies and creating a difficult-to-reverse warming cycle.
What we can do about it: Begin to price the climate-change effects of emissions, mostly by building those costs into the price of fossil fuels.
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