It is. There is no longer a legitimate question about it. It's been proven so many times over. And never been disproven, just disagreed with by a tiny minority
Your post assumed a whole lot more than that.
We can shrug our shoulders, do nothing, because, hey India isn't doing their part. The cost will be astronomical and destroy civilization as we know it. People will mostly still be around. Oh - and that cost to our food supply? There won't be much food supply.
OR, we could do our part, develop technology so EVs AREN'T recharged with fossil fuels, make renewable energy cheaper - it can eventually be far cheaper than fossil fuel. India and China will want in on that cheap energy. We spent a lot, but not an astronomical lot. And my Grandkids will go to colleges, raise families in comfort.