Greta Thunberg draws a crowd upon arrival in Spain
Greta Thunberg draws a crowd upon arrival in Spain

Greta Thunberg has arrived in Madrid to join thousands of other young people in a march to demand world leaders take real action against climate change.

The Spanish capital is hosting United Nations-sponsored talks aimed at streamlining the rules on global carbon markets and agreeing on how poor countries should be compensated for destruction largely caused by emissions from rich nations.

The two-week talks come as scientific evidence mounts about disasters that could ensue from further global warming, including a study commissioned by 14 sea-faring nations due to be published on Friday that predicts that unchecked climate change could devastate fishery industries and coral reef tourism.

That could cause hundreds of billions of dollars in losses by 2050, says the report, adding that limiting global warming would lessen the economic impact for coastal countries but that they also need to adapt to ocean changes.