I think this, in some way, can be interpreted in a way favorable to the original parent's comment. Kids being stressed by climate change to the point that their feelings overwhelm all of their coping mechanisms is not an effective strategy for actually fixing the root cause.

Ideally, kids would develop, by trial and error, effective strategies for identifying solvable problems and dealing with them, and not being extremely negatively affected by (directly) unsolvable problems. It would be beneficial for society if people heard about climate change and thought, "Okay, that won't be good, so what are some things I can do in the short term and in the long term to make a positive impact?" The great thing about such an approach is that it's omni-applicable, such as when one's car breaks down on a long drive, etc.

Parents who constantly hover around their kids presumably interfere with this vital process, perhaps because these important lessons can only be discovered, not forcibly taught.