I think there's a good argument embedded in your post: That trying times are not necessarily an argument against having kids of your own. But something that those previous hardships/disasters/etc, that you mention is that they were temporary. There exists a really good chance that the impending climate crisis is one that humanity, or at least "civilized" humanity, might not recovery, or even survive. I'm not sure where I personally stand on natalism, but to diminish the struggles of future generations to overcome the damage to the climate ours and previous generations have done to "might be difficult... in 50 years" seems shortsighted.