Religious clergy, students and activists marched through the Philippine capital calling for curbs on emissions to mute the impact of climate change, which is blamed for a spike in typhoons and extreme weather that has wreaked havoc on the nation.
The march, attended by more than 2,500 people according to police and expected to build throughout the day, was one of a number of events scheduled in different parts of the country.
"Protect our common home," and "climate justice," were written on the placards held aloft by the surging crowd.
"We want to send a message to the rest of the world, especially the world leaders at the climate talks, to say that our survival is not negotiable," said Denise Fontanilla, spokeswoman for the Asian People's Movement on Debt and Development.
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"We are walking together because we know what it's like to protect our country," said Larissa Baldwin, from an indigenous climate youth network.
Pacific islands are particularly at risk from the fallout of climate change, especially rising sea levels.
"These are people that are calling for a just transition to renewable energy," Baldwin told AFP.
Senator Larissa Waters from the Greens party said the turnout, after tens of thousands marched in Melbourne, showed the strength of opposition to plans to develop more of Australia's vast coal deposits.
Organisers in Paris expect hundreds of thousands to take to the streets Saturday in Asian cities as well as Johannesburg and Edinburgh, with similar events set for Sunday in Seoul, Rio de Janeiro, New York and Mexico City.