I'd say humans are much more resilient than you think, and Indians probably even more so, because they are used to hard life.

Or, to say it another way, many parts of India or other countries at this latitude have never been "suitable for human habitation" compared to e.g. France and her tempered climate. But humans adapted to this place, and will adapt to 2 degrees more if needs be.

I'm not sure it's pedantry. We're so used to the pretty Hollywood storyline that I think people assume that any climate issue will just turn out okay in the end. But of course, Nature doesn't have the capacity for happy endings — that's a human construction. We could easily become nothing but a footnote in the history of the planet, if we're not careful here.

Pretty much every species which has roamed the planet has gone extinct. Nature is tough. I think that's the point of emphasizing the phrasing.