A green roof on San Francisco's Bernal Hill. (Credit: Courtesy of Ike Edeani)
(This post originally appeared in the online science magazine Hawkmoth. Follow @HawkmothMag to discover more of their work.)
A green roof on San Francisco's Bernal Hill. (Credit: Courtesy of Ike Edeani)
(This post originally appeared in the online science magazine Hawkmoth. Follow @HawkmothMag to discover more of their work.)
Sign up for our weekly newsletter and unlock one more article for free.
View our Privacy Policy
Want more?
Keep reading for as low as $1.99!
Already a subscriber?
Find my Subscription
Save up to 40% off the cover price when you subscribe to Discover magazine.