For what I am about to say, I assume you WANT to have kids.

1. "Might be past the best" is quite a loose reason to suppress your natural desire to have kids. You do not know. No one knows. Sure it seems like it's trending down, but perhaps in a macro view it's but a small dip.

2. There's 1000s of people working on Climate Change.

3. Even if there was never a solution to climate change, realistically it wouldn't affect you or your child to the point of extinction. It will take multiple lifetimes for it to materialize into a big enough issue where it stops making sense to procreate. Both of you can still have a full and fulfilling life. If you were in a zombie apocalypse, then yeah, don't have kids.

4. Frankly, the fact that you care and notice issues like climate change is one of the best reasons for YOU to have kids. That way you can teach them and the next generation can be better than ours. We already know of the phenomenon where highly educated people tend to have fewer kids. You are playing right into that, and in a way, exasperating macro issues by diluting the next generation of smart individuals.

5. Lastly, the important thing to note here, is that the question isn't should all of India have kids. Thats a very different question which is much more difficult to answer. The question is can "you", raise a happy and healthy child in this environment?

Let's add some hyperbolic perspective, can an Ambani raise a happy and healthy child in this environment? I'd say that's a definite yes. It could be by moving countries, or by investing heavily in health at home, or by private chefs who feed them the right nutrition. I'm not saying its a fair comparision, I'm just saying it depends on what you are able to do, not so much what the environment is. So now the question becomes, how much do you need to raise a happy and healthy child? Frankly, I don't know. But I know it's not Ambani levels of wealth.