That seems like a very dramatic overstatement. Climate change is a serious problem, but hardly past human ingenuity to deal with. It's not like your children will be in a hell world. It'll be warmer, more storms, challenges due to changing sea level and arable lands shifting etc. It won't be a cataclysm but will play out over decades and centuries.
Your child, and your children's children will be fine.
Your child, and your children's children will be fine.