Tens of thousands of people took to the streets of Copenhagen on Saturday to demand action to cope with climate change from the participants of a UN climate conference underway in the Danish capital.

BBC reported that the protest has been "mostly peaceful" despite "some arrests." But AFP quoted police as saying some 400 people were arrested Saturday.

The 15th UN climate change conference, a result of two-year international talks on a binding treaty to cut global carbon emission, began in Copenhagen on Monday. The conference, which puts together about 15,000 participants from 192 countries, will run until December 18. It has so far failed to produce a plan to fight global warming.

On Friday, 68 protestors who chanted "Our climate is not your business" were detained in the city.

Some 60,000-80,000 protestors from different countries were to join today's march through the city to the conference center, according to organizers.

The Kyoto Protocol, a legally binding agreement restricting carbon emissions, expires in 2012. A new deal is needed to continue efforts beyond 2012.

A new binding treaty to cut global greenhouse emission is widely expected to be agreed during the talks in the Danish capital.

However, some observers say the summit is more likely to just outline principles and directions for a post-Kyoto framework.

MOSCOW, December 12 (RIA Novosti)