> Does any country care?

China ostensibly cares, their five year plans drawn up by committees of Engineers (Civil, Mechanical, Electrical) and Scientists are on an arc to minimise reliance on fossil fuels and transition to renewables (wind, solar), and nuclear.

There are strategic reasons for this, of course.

> Isnt China far worse thsn the US?

"It's complicated"

* Historically the US is responsible for a greater mass of the CO2 humans have added to the atmosphere.

* Currently, China is adding more per annum (and India is in the bleeding edge mix also, as is Australia) in absolute terms, but still less(?) in per capita terms (having a much much larger population).

* China is still using coal (although they are on the cusp of peaking their use) - that gets thrown at them a lot, the caveats are

-- China shut down a lot of badly polluting inefficient coal power plants.

-- China opened up a lot of more up to date less polluting but still coal power plants.

-- China is using these to power all manner of stuff including the build out of the largest renewable power components production line in the world.

-- Coal is set to be phased out "soon" (and it seems to be slowly going that way, see peaked comment above).

* A lot of China's CO2 emissions are a direct result of their mineral processing, production, and assembly of the rest of the world's consumption.

( eg: The case can be argued that the fall in US per capita CO2 emissions is a result of US consumption now being met by manufacturing that has moved from the US to China)

There are literal books and stacks of research papers arguing about each point mentioned above - and that's just skimming the surface.

China has a far lower per capita carbon emissions rate than the US. Has a growing share of energy produced by green technology. Is the world leader in manufacturing electric cars and using electric cars. Is the global leader in low cost solar panels and batteries among other green technology. Oh yeah, and a huge portion of their emissions go to making things that Americans consume. On top of all that, they have managed to stop growth in their carbon emissions and are on the cusp of reducing them.

I don’t know how China could possibly be considered worse except that they historically used coal, and are rapidly transitioning away.