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COP26 summit nears conclusion after surprise U.S.-China pledge to tackle climate change

The coverage on this live blog is now over.

International lawmakers, business leaders and activists convened in Glasgow, U.K. on Thursday in the final days of the COP26 climate summit.

Delegates have been asked to accelerate action on climate change and commit to more ambitious cuts in greenhouse gas emissions, all in an effort to limit global temperature rises.

Here are some of the biggest developments Thursday: