* UK, US and China among countries representing two-thirds of global economy to agree to push green energy and cars.* They plan to make many technologies cheaper and make them available to the whole world, starting with clean electricity, electric vehicles, green steel, elecrolytic hydrogen and sustainable farming.

This won't make the global heating problem fix itself — we will still need to end deforestation, and fund quick adoption of these new solutions. That will require a lot of investment in poor countries.