India, "still a coal Goliath" is a better description. They burn a massive amount of coal compared to most countries. They've just scaled slightly back on a massive coal consumption plan they implemented in the last few years. Nice, but hardly worth any recognition in the shadow of the damage they have already done.
As expected, much more favorable terms were renegotiated to get India on board; India now gets to grow their CO2 emission as a function of GDP. A simple extrapolation of this shows they'll double their already huge CO2 output by the end of the decade, far surpassing the US.
Made the deal a lot easier to sign.