100s of 1000s... As Far As the Eye Can See': Climate March Descends on Manhattan (UPDATES)

NEW YORK (TheBlaze/AP) — Demonstrators are making their way through Manhattan's streets as part of a series of global marches over climate change Saturday.

"100s of 1000s for #PeoplesClimate March as far as the eye can see," tweeted ABC's Micah Grimes.

100s of 1000s for #PeoplesClimate March as far as the eye can see down Manhattan's 6th Avenue: pic.twitter.com/o5VcSF4tWj

— Micah Grimes (@MicahGrimes) September 21, 2014

Thousands filled the streets Sunday near Columbus Circle and Broadway, including actors Mark Ruffalo and Evangeline Lilly.

Father and son at the #peoplesclimatemarch. "I want to expose him to environmental issues." pic.twitter.com/liXqc5UP4O

— Bianca Consunji (@biancaconsunji) September 21, 2014

TheBlaze's Oliver Darcy was on the scene Saturday, reporting that the march had attracted "very radical factions" including communists.

It should be noted that this #PeoplesClimateMarch contains very radical factions. Self-described communists, etc. pic.twitter.com/yVCAKMWaHH

— Oliver Darcy (@oliverdarcy) September 21, 2014

He also noted the possible presence of certain plant-based substances...

Also it's hard to ignore the smell of marijuana in the air at times.

— Oliver Darcy (@oliverdarcy) September 21, 2014

...and photographed a celebrity attendee.

Just saw @LeoDiCaprio at #PeopleClimateMarch. pic.twitter.com/uAcjbfCbl0

— Oliver Darcy (@oliverdarcy) September 21, 2014

He also found an ironic injection of capitalism in socialist advocacy.

This guy is selling a socialist newspaper to climate march attendees for $1.00. pic.twitter.com/1ALuxRy5wY

— Oliver Darcy (@oliverdarcy) September 21, 2014

BuzzFeed reported that 100,000 people were expected at the NYC march, before updating with an estimate that 200,000 had shown up.

Peacekeepers reporting 200,000 people at #PeoplesMarch, twice as expected.

— Nicolás Medina Mora (@MedinaMora) September 21, 2014

Other cities held similar marches. In London, organizers said 40,000 took part including actress Emma Thompson and musician Peter Gabriel. A march in Melbourne, Australia drew 10,000 people.

The Manhattan march comes two days before the United Nations Climate Summit. More than 120 world leaders will convene Tuesday for the meeting aimed at galvanizing political will for a new global climate treaty by the end of 2015.

The march also coincides with New York's annual climate week, which will include a string of events this week, some featuring celebrities, CEOs and climatologists.

This story has been updated.

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Follow Zach Noble (@thezachnoble) on Twitter