The largest people climate march rock the city with an estimated of more than 310,000 people who filled the streets for hours.

Protesters chanted, “What do we want? Justice! When do we want it? Now!” They carried signs with messages that read: “Go Solar,” “You Control Climate Change” and “There Is No Planet B.”

The march is the first in a series of events held around the world this week to shine a spotlight on global warming ahead of the U.N. summit Tuesday. President Obama and world leaders from government, finance and business will be at the U.N. to announce initiatives meant to move the world toward limiting global warming.

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