Earth Day quiz: How much do you know about climate change?

World’s largest secular observance returns as need for multilateral action to address global warming becomes ever-more acute

Earth Day 2021 is upon us, with the need for unified action to address the climate crisis more urgent than ever.

All eyes this year will be on US president Joe Biden’s virtual world leaders summit from the White House, where he hopes to obtain bold new commitments from heads of state to ensure their nations are doing their utmost to uphold the terms of the Paris agreement and bring greenhouse gas emissions back down to manageable levels.

But how much do you know about Earth Day and the threat posed by climate change? Take our quiz below.