> There is an international court of human rights. How often was India found guilty there?
The International Criminal Court is not the European Court of Human Rights.
The ICC appears to be focused on crimes against humanity, and I'm not a lawyer so I'd be even worse than ChatGPT at figuring out if climate change would be under that banner.
India is neither a state party, nor a signatory, to the ICC, so (again, IANAL) I assume that means they can't be taken before it.
> When will India/China act?
They already are, because despite the memes the problem itself is directly relevant to both, and the solution happens to be a cheap export opportunity and soft power projection opportunity for one, and a subsidised cheap economy growth opportunity for the other.