Millions Hit Streets for Global Climate Change Strike

*How big was the global climate strike? 

Millions of people took part on Friday's Global climate strike, and estimates of total crowd sizes are still rolling in, some as high as 4 million.

Friday was a truly historic day for the potent new social movement committed to sounding a global alarm about the climate crisis.

The Global Climate Strikes, inspired by Swedish climate activist Greta Thunberg, age 16, may end up being the largest mass protest for action on global warming in history.

Friday's climate strike

The protesters marched from New Delhi to Antarctica, to draw attention to the climate crisis ahead of the United Nations Climate Action Summit, which kicks off on Monday.

The event was truly global and astonishingly well organized. There were over 2,500 events scheduled in over 163 countries on all seven continents.

According to the Guardian, China, the largest emitter of greenhouse gas emissions, was noticeably absent from the images of protesters shared by Thunberg and other organizers on Twitter.

The group pegged its "best guess" at total crowd size for the Women's March at more than 4 million in the U.S. alone, placing it among the largest protests in world history.

Others include the nearly 4 million people across France who marched in solidarity against terrorism following the 2015 Charlie Hebdo attack, and the 2003 worldwide protests against the war in Iraq, when somewhere between 10 and 15 million people protested, according to various estimates.

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