BRUSSELS, Dec 3 (Reuters) - Police said about 20,000 people protested in the Belgian capital on Sunday to demand more action to fight global warming as delegates from some 200 countries met in Dubai for the United Nation's COP28 climate conference.

Marching to the beat of drums, protesters waved banners saying "ACT NOW" - the "O" stylised to resemble the Earth on fire - and "There is no Planet B".

"We think it's really important to raise everyone's awareness, especially the children's, about the future of the planet and about leaders who don't always listen to what's going on," said a protester who attended with his son and gave his name as John.