U.S. President Joe Biden's pick for U.S. ambassador to the United Nations is Linda Thomas-Greenfield, a career diplomat with extensive experience in the foreign service and on Africa issues.

Pending Senate confirmation, she has promised among other things to bring America back into international diplomacy, and curb China's influence at the world body. 

But who exactly is Linda Thomas-Greenfield and what would her appointment mean for the rest of the world?

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