[See our full report on the march here.] The People's Climate March, which is being called the "largest climate march in history," has begun in NYC. You can check out the parade route and all the street closures here, and get some background on the event, which Gothamist contributor Nick Pinto describes as "the first tentative outing of a broader movement, a coalition that includes not only the usual white environmentalists, but unions and representatives of the (frequently poor and minority) communities hit hardest by the effects of climate change."

If you can't make it to the march, you can watch a livestream of the event via Democracy Now. We'll be updating this post all day depending on what happens at the march. Below, check out photos of various signs, politicians, celebrities (Al Gore! Sting! Leonardo DiCaprio!), and bananas (?) involved in the march.

The mood right before the #PeoplesClimateMarch starts is pretty festive. Lots of dancing, music. pic.twitter.com/YfB15w6YKM — Bianca Consunji (@biancaconsunji) September 21, 2014

People's Climate march interview conducted over the sleeping body of a homeless woman pic.twitter.com/GyBhrnl9VI — Christopher Robbins (@ChristRobbins) September 21, 2014

#FloodWallStreet showing up early with some of the first art on the street for the #peoplesclimate march. pic.twitter.com/CoTMFjFH3Z — People's Climate (@Peoples_Climate) September 21, 2014

Festive atmosphere as thousands prepare to march @Peoples_Climate urging global leaders to act on #climate change. pic.twitter.com/xR9NaCNKV6 — M. Scott Mahaskey (@smahaskey) September 21, 2014

Extensive use of #NYPD barricades and penning at #climatemarch assembly area no other city does this. pic.twitter.com/XpbpYgDBx3 — Alex S. Vitale (@avitale) September 21, 2014

TWU's JP Patafio: If corporations don't act on climate change we'll shut 'em down pic.twitter.com/GbHp1nfJrZ — TWU Local 100 (@TWULocal100) September 21, 2014

At Columbus circle pic.twitter.com/Z8WsiiGdmh — erin mccann (@mccanner) September 21, 2014

We have to take action for the #peoplesclimate to protect their future. I see a few future presidents in the crowd! pic.twitter.com/fwes2ciavM — Scott M. Stringer (@scottmstringer) September 21, 2014

One of many puppets at the #peoplesclimate march: pic.twitter.com/pSsc9XmzVM — Nick Pinto (@macfathom) September 21, 2014

Drumline rocks the Climate Change March. pic.twitter.com/S6vvaaLzdp — Jody Rosen (@jodyrosen) September 21, 2014

"The Future," a 3,000 pound ice sculpture, has been unveiled beside the Flatiron Building. pic.twitter.com/azy6g6Qt5u — Annie Correal (@anniecorreal) September 21, 2014

Leonardo DiCaprio is surrounded by people taking selfies with him #PeoplesCIimate — Christopher Robbins (@ChristRobbins) September 21, 2014

Update: Even more!

At the climate march. Yay planet earth. Disturbing amount of tie-dye here tho pic.twitter.com/4PcdIwoPNy — Caleb Hunt (@keirebuhanto) September 21, 2014

Lots of signs show concern with tar sands, fracking and other non conventional oil wells. #PeopleClimateMarch pic.twitter.com/y3WTSmZScl — Nicolás Medina Mora (@MedinaMora) September 21, 2014

Lots & lots of young folks in #ClimateMarch. Last time I saw so many young folks marching was in Vietnam War protests pic.twitter.com/LyRNv2W657 — Steven Greenhouse (@greenhousenyt) September 21, 2014

Climate March ready to start in Upper West Side of Manhattan. Left-winged insects in attendance. #PeoplesMarch pic.twitter.com/TJwXyepF1s — Nicolás Medina Mora (@MedinaMora) September 21, 2014

This artist from Brooklyn calls his mobile cave, "Earth's delegation to the UN." pic.twitter.com/adQpCTEU5j — Annie Correal (@anniecorreal) September 21, 2014

Cassidy Scantlen, 2, in his fish costume. pic.twitter.com/RGvmNzmY04 — Kenneth Rosen (@kenneth_rosen) September 21, 2014

It seems the celebrities are clogging things up at certain areas of the march because people keep stopping to take photos with them/of them:

ha ha but really: the celebrities are a mobile hair clog for this march, NYPD getting agitated #PeoplesCIimate — Christopher Robbins (@ChristRobbins) September 21, 2014

Also, somebody built an ark:

Updates: Even more colorful signs, celeb sightings, and a moment of silence.

Utterly overwhelming--this is the largest political gathering about anything in America in at least a decade — Bill McKibben (@billmckibben) September 21, 2014

Leonardo DiCaprio marches with indigenous groups @Peoples_Climate in NYC. pic.twitter.com/aOoKZEZ0hM — M. Scott Mahaskey (@smahaskey) September 21, 2014

Profiting from climate change. pic.twitter.com/RGBG0DubkG — Kenneth Rosen (@kenneth_rosen) September 21, 2014

Mayor De Blasio marching w/ Al Gore & a ton of NYPD, including Asst Chief Thomas Galati of NYPD Intel #PeoplesCIimate pic.twitter.com/xhLbFpkx0O — Christopher Robbins (@ChristRobbins) September 21, 2014

The legendary primatologist Jane Goodall. Also DeBlasio and Gore. Mystery man at right w/ ear thing. #climatemarch pic.twitter.com/pr0f20IGs6 — Will Dizard (@willdizard) September 21, 2014

Some meditation in the grass along the march route. #climatemarch pic.twitter.com/QHzaqZ7uFp — Zoë Schlanger (@zoeschlanger) September 21, 2014

Protest watching parties are in chairs on the sidewalk on Central Park West pic.twitter.com/NT4dFNmlvl — Sarah Nir (@SarahMaslinNir) September 21, 2014

There was a moment of silence around 1 p.m.:

Hands are raised in the air for a moment of silence at the People's Climate March pic.twitter.com/JIKuzddbtI — Aaron Short (@aaronshortstory) September 21, 2014

Ok, that moment of silence was legit cool. — Nick Rizzo (@nickrizzo) September 21, 2014

Update: More floats, more signs, more participants.

People wave to participants in the Climate March walking along Sixth Avenue (Photo: @jakenaughton for NYT) pic.twitter.com/Db7oXdvvbi — NYT Metro Desk (@NYTMetro) September 21, 2014

I Want To Teach My Kids How To Ski sign guy fortunately very bashful pic.twitter.com/KVkzW4SuUq — Helen Holmes (@helenyells) September 21, 2014

At the People's Climate March with this enormous inflatable cow, solid Sunday. pic.twitter.com/DcLO0q8APj — Kelly Weill (@KELLYWEILL) September 21, 2014

Times Square's costumed characters are adapting to the #PeoplesClimate march pic.twitter.com/12J9Shq0BK — Christopher Robbins (@ChristRobbins) September 21, 2014

I haven't walked in months. Today I walked 60 NYC Blocks for the #PeoplesClimate March pic.twitter.com/KcOi98GjeX — Marvin Bing (@MarvinBing) September 21, 2014

LAguardia high school in NYC ...located just minutes from the march route :) pic.twitter.com/EHmKML4TrP — People's Climate (@Peoples_Climate) September 21, 2014

Even the United Nations is getting in on the action:

Update: We have the first official count of how many people showed up for today's march: 310,000.

Official--and very conservative--crowd count is 310,000. 4x larger than any climate rally ever — Bill McKibben (@billmckibben) September 21, 2014

Probably much larger than 310k-- but even at that the biggest protest about anything in America in a very long time — Bill McKibben (@billmckibben) September 21, 2014

Update: The Parade is still marching on, but it's almost over now. Check out a few final images, Tweets and aerial footage of the march below.

NYC kid from a Sandy-affected neighborhood. His sign says “Still struggling.” #PeoplesClimate pic.twitter.com/lb3mQhoP5p — Zoë Schlanger (@zoeschlanger) September 21, 2014