International Day of Climate Action (4 images)
International Day of Climate Action
Lantern walkers write "350" using long-exposure photography on the International Day of Climate Action in Sydney, Australia on October 24, 2009. The number 350 represents what scientists say is the safe upper limit for carbon dioxide in the Earth's atmosphere. UPI/Peter Solness/350.org

Most Popular Collections
« Prev Photo 1 of 4 Next »
Share this image