WATCH ONLINE DOCUMENTARY ! Teams of scientists around the world have been working on the possibility of artificially hacking the climate to help arrest climate change. But the technology is in its infancy and ethical doubts linger. In Switzerland, a start-up builds giant fans that suck carbon from the air. It’s then sold to a greenhouse where it’s absorbed by plants to make them grow faster. Perhaps sooner than you might think, climate hackers will have their day in the sun.