As this year's UN climate summit kicks off in Brazil, the stakes are higher than ever.

The world has changed dramatically in the decade since leaders celebrated a historic climate agreement in Paris a decade ago, but not quite in ways they expected or wanted.

The warming of Earth's climate has continued faster than society has been able to wean itself from burning the coal, oil and natural gas.

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There's been progress — more than a degree Celsius has been shaved off future warming projections since 2015 — but the lack of enough of it will be a big focus for the next two weeks as diplomats gather in Belem, Brazil, for the annual United Nations climate negotiations.

The aim is simple, but lofty: for countries to work together to s

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