What is the Paris climate agreement and why did the US rejoin?

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The US has pledged to cut carbon emissions in half, compared with 2005 levels, by the end of this decade. The new target will be unveiled at a virtual summit of 40 global leaders.

The announcement comes after President Joe Biden reversed predecessor Donald Trump’s decision to withdraw the US from the Paris Agreement.

What is the Paris Agreement?

The Paris Agreement is a legally binding international treaty on climate change.

Adopted by nearly 200 countries in the French capital on