Tens of thousands of people marched in Manhattan to raise awareness about climate change on Sunday.

It was called the People’s Climate March, but the global power elite was there.

“I hope that this power and heat will help cool the global temperature rise,” United Nations Secretary General Ban Ki-Moon, who will host a climate change summit in New York this week, told the Associated Press. Other  politicos on hand included former vice president Al Gore and New York Mayor Bill de Blasio (D).

Hollywood was also well represented.

“This is important for every single person on the planet, which is why it has to be the greatest grass roots movement of all time,” actress Emma Thompson said. “This is the battle of our lives. We’re fighting for our children.” Fellow thespians included Leonardo DiCaprio and Mark Ruffalo, as Variety reported.

“People realize that we can’t leave the fate of the planet up to our politicians,” May Boeve, executive director of the international climate group 350.org, which organized the march, told National Geographic. “We need to come together, raise our voices, and apply pressure where it counts.”

Here’s what the rally looked like: