An activist dressed as a tree attends a climate-change conference. (Bob Strong / Reuters)

“Forests might be more socialist than we thought.” Franciska De Vries, who studies ecosystems, on how trees share carbon.

“I’ve not had a good sleep since I started this job,” Amit Reddy, a first-year science teacher.

“Work isn’t the answer to everything, but it is the answer to most problems that people have,” David Riemer, who created a program that provides jobs.

(Previous quotes from our sources here.)