Yes, all these things need to be done. But, again, most of these things will matter little if in 30-50 years much of our planet becomes uninhabitable, which is now nearly certain unless we take immediate action.
Those 2-3 billion people on earth you mentioned? Most of those live in the tropical zones and if we do not concentrate on fighting climate change NOW, will not have a place to live. Healthcare will be a secondary issue.
