On Sunday, Sept. 21, demonstrators from more than 1,000 organizations representing millions of people plan to demand that world leaders take action against global warming. The People's Climate March through midtown Manhattan will be the "largest climate march in history," according to its organizers. And it will kick off the sixth annual Climate Week NYC—with about 80 events focused on climate change such as high-level meetings, conferences, lectures and debates.

A United Nations summit in New York City will also take place during Climate Week, which will help lay the groundwork for climate-change treaty talks next year in Paris.

Here's a look at 10 top places to be during Climate Week (some open to the public, some not) and their locations, including the People's Climate March route:

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