© Jessica Scranton
The trees that could make or break Mexico City’s future
By Molly Bergen
December 15, 2016
CI’s Jürgen Hoth talks air pollution, the illegal drug trade and why planting trees isn’t always the answer.
© Rod Mast
5 things you might not know about the sky
By Sophie Bertazzo
April 18, 2016
Sky makes life possible — but it’s under threat from humanity.