Since national governments seem unable or unwilling to act, cities may end up being at the forefront of the fight against climate change. This map shows what the world's largest cities are facing, and what they're going to do about it.
Plastic is one of the great inventions of the 20th Century. But is it a half-formed innovation? We need to push the innovation of plastic further, and throw the current brand of plastic in the recycling bin.
More than half the people on Earth now live in cities, so they'll be where we have to face our changing weather patterns. The most prepared cities are finding ways to keep citizens safe--and make them money.