There's been a lot of talk about China and India but in Glasgow, many eyes will also be on the US, the world’s second-biggest emitter of carbon.
President Joe Biden’s Democrats plan a big investment on climate through a key budget bill - but that awaits a vote in Congress and has been the subject of difficult negotiations.
Dr Leslie Vinjamuri, an international relations expert from SOAS university in London, says Biden’s bill may not be finalised, but if it passes it could be “transformative”.
She says much of the focus has been on what has been taken out of the bill to win support, but it still includes $550bn (£402bn) of investment, including tax credits for solar and wind power, and investment in electric vehicles.
Views on climate change are “the biggest division” between Republicans and Democrats in the US and President Biden faces an “uphill battle”, Dr Vinjamuri tells BBC Radio 4's Today programme.
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