Tens of thousands of protesters on Saturday marched through the chilly Danish capital and nearly 1,000 were detained in a mass rally to demand an ambitious global climate pact, just as talks hit a snag over rich nations' demands on China and other emerging economies.
The mostly peaceful demonstrations in Copenhagen provided the centerpiece of a day of global climate activism stretching from Europe to Asia.
Police assigned extra officers to watch protesters marching toward the suburban conference center to demand that leaders act now to fight climate change.
Police estimated their numbers at 40,000, while organizers said as many as 100,000 had joined the march from downtown Copenhagen. It ended with protesters holding aloft candles and torches as they swarmed by night outside the Bella Center where the 192-nation UN climate conference is being held.