New Yorkers took to the streets Oct. 24 as part of the International Climate Day of Action to deliver a message to President Obama and global leaders to take drastic actions to decrease the level of carbon dioxide in the atmosphere. Climate scientists have calculated that atmospheric carbon levels have risen to 385 parts per million (ppm). They believe that the upper safe limit is 350 ppm. Despite torrential rains, activists marched across the Brooklyn Bridge brandishing signs with the number “350” to raise awareness of the issue. Some 5,200 grassroots actions took place around the world in 180 nations, less than six weeks before the U.N. Climate Conference is to begin in Copenhagen, Denmark. For more information, check out 350.org.