The Americans are coming.

President Donald Trump's administration may have steered clear of this year's UN climate summit in the Brazilian Amazon, but the conference's second day on Tuesday is nonetheless set to be dominated by the governors of California and New Mexico.

Anticipation is building particularly around California's telegenic leader Gavin Newsom, who governs the world's fourth-largest economy and has sought to cast himself as the Anti-Trump -- with murmurs of a 2028 presidential run in the air.

"We are doubling down on stupid in the United States of America," the Democrat told an audience at a Milken Institute event in Sao Paulo on Monday, giving a taste of the sharp anti-Republican rhetoric for which he has become known. "Not in my state of California."

Newsom's agenda in

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