Thousands of people marched through Brussels, Belgium on Sunday to push world leaders to take bolder action to fight climate change at the U.N. climate summit in Glasgow starting this month. 

The summit aims to secure more ambitious climate action from world leaders to drastically cut the greenhouse gas emissions heating the planet.

A U.N. climate science report warns that human activity has ensured that there will be climate disruptions for decades, but that rapid, large-scale action to reduce emissions could still stave off some of the most destructive impacts.

Environmentalists worry the summit will produce policies that don’t do enough to cut carbon emissions and actions that aren't on the scale needed to avert disaster.

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