By Cat DiStasio
Imagine a world in which the high-rise buildings that crowd our city blocks could reverse the effects of climate change and perhaps even heal the planet. Each year, architects from around the world come up with wild and crazy ideas for the eVolo skyscraper competition. This year's contest spurred lots of imaginative and inspirational designs, including a bizarre "anti-skyscraper" that would excavate of Central Park. Other proposals in recent years have included high-rise buildings that house urban farms, generate hydrogen fuel using electricity from lightning and cool the planet with space-scraping wind tunnels.