The key here is not to be concerned with them being afraid of having children because of 'global warming'. The key is to be thankful that people that ignorant, foolish and gullible enough to fall for this so-called 'global warming does not have children as that could cause problems for the children as they grow up. There is no telling how someone who is that ignorant, foolish and gullible would raise them. The children would probably turn out to be fearful of every single thing not only in real life but imaginary things that do not exist.