One of the reasons coastal areas are so vulnerable to rising sea levels is that human populations tend to concentrate in them. Therefore, even a small rise in sea level can, for instance, compound the damage done by storm surges, leading to massive losses. Some cities, like Amsterdam, are already largely below sea level and must be protected by dykes (that will have to be raised in response to climate change).
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.