I think that we should try to save the world but just for the animals and plants because humans do not deserve it just because they are destroying those life forms. Sad thing is that humans will probably be one the last species alive and when they do finally go away(in any way it will happen: extinction, colonization of other planets...) the life on this planet will probably be destroyed or it will be just like it was in the beginning. The problem with saving the world is that it is practically impossible considering how many humans are on this planet and that they all want best possible standard of living.Less than a 50% of humans has modern standard of living and it brought us to big problems already, now imagine what would happen if that percentage grows for 20% or more the problems would grow exponentially. The other problem is that you can't teach all people to care for environment in fact probably most people won't care about it at all. So to conclude this i want to save the world but think it is impossible as long humans are here in such big number(one of my professor at college told us that, based on some recent studies, in order to have modern standard of living and not to have big impact on environment there should be just 5% of todays population on planet).

I don't think the whole world will start doing anything or making a really large effort until the consequences actually are about to or already hit us. How many people on the street do you see talking about global warming? Maybe in a science class, but thats about it imo