2009-12-12
Danish police made a number of arrests during the protests
Trouble has broken out as thousands of people marched through Copenhagen demanding action from leaders at UN climate talks there.
Most of the march in the Danish capital passed off peacefully, but one group smashed windows and was arrested.
Hundreds of others were detained in a preventative action by police.
Security has been tight along the four-mile (6km) route, with extra police on the streets and security fences put up around some buildings.
Marches were also held in Australia, Hong Kong, Jakarta and the Philippines.
Danish police said they had rounded up more than 300 people in a preventive action against a section of the demonstration, AP news agency reported.
Television pictures showed scores of people on the ground with their hands tied and surrounded by riot police.
More than 50 other protesters were arrested in Copenhagen following a smaller demonstration on Friday.
Organisers said up to 100,000 protesters from around the world had joined Saturday's march across the city to the conference centre where negotiators and ministers are meeting.
Danish police estimated that up to 30,000 people had taken part.
The BBC's Matt McGrath, in Copenhagen, said the crowd was colourful, with some protesters dressed as polar bears and others draped in blue and green to show their support for the planet.
Activists are arguing for an ambitious, legally binding agreement on emissions cuts to be signed by world leaders at the summit's conclusion at the end of next week.
"This is the right time to shout out and let leaders know this is serious business for us all. Lets hope they listen," Lin Che, a 28-year-old student from Taiwan, told Reuters news agency.
A number of famous figures said they would join the protest, among them Bollywood actor Rahul Bose, model and photographer Helena Christensen and former UN human rights commissioner Mary Robinson.
Helena Christensen told the marchers: "It's incredibly difficult to reach agreement in families, so to reach it between nations obviously will be a long and difficult process. But that's what they are there for and that's what we expect from them."
'Safe climate'
In Australia, where events were held as part of the country's fifth Walk Against Warming, the largest protest was held in Melbourne.
Demonstrators in Manila, 12 Dec
In pictures: Climate protests
The march closed with protesters spelling out the message "Safe Climate - Do It!" on the ground.
Organisers said aerial photographs had been taken and would be sent to delegates at the talks in Copenhagen.
In Adelaide, activist James Dannenberg told state radio: "We want [world leaders] to bring home a treaty, we want them to stand by the Pacific and our neighbours there.
"And we want them to deliver and ensure a safe climate future for us all."
Thousands of demonstrators also gathered in front of Australia's parliament house in the capital, Canberra.
On Friday, European Union leaders agreed a three-year deal to pay 7.2bn euros (£6.5bn; $10.6bn) to help poorer nations cope with climate change.
But leaders of developing countries and some aid agencies described the sum offered by the EU as inadequate.
Meanwhile, in Copenhagen, officials released a draft text of a possible final deal in which rich countries are asked to raise their pledges on greenhouse gas emissions cuts.
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