A home in Sydney look like any other, but it is almost completely self-sufficient. A greenhouse in England is the size of ten tennis courts. The city of Paris embraces bicycles to cut pollution and congestion. In the Philippines the mounting problems of plastic waste has prompted some businesses to find a better way. Scientists in Israel have found a way to produce large-scale solar power at a competitive price. A London gallery mounts the exhibition “Exposed,” a collection of pictures by top British photographers that capture the reality of climate change in the U.K. Since winning the bid to stage the 2008 Olympic Games, the Chinese government worked steadily to clean up the host city, Beijing, one of the most polluted cities in the world.