Yes- I'm certain that over population is THE major cause of climate change. I don't think we are willing to put in the changes needed to cut down on our individual consumption enough. Governments don't want us to either. Capitalism relies on people consuming resources. I doubt many people REALLY want to go and live off grid. It sounds nice till you think of what you would need to give up.
We may care about the environment and animals but how many of us want to go vegan, stop using plastic, cut down on our energy consumption, not have children? We'll make small changes but I doubt that's enough. I really think the only way this planet could recover is if there were a LOT fewer of us.
I think I read a statistic the other day that humans have altered 97% of the earth's land through habitat and species loss. We are an incredibly destructive species. If there were fewer of us, at least that tendancy would be contained.
Morally though- I actually don't agree with environmentalists who say all other animals develop an equilibrium with their environments. I personally think if any species is left unchecked- it will TRY to take over. I believe it's nature that keeps things in check- predators, lack of food and resources, disease. Not some innate desire for harmony. We've just learnt to overcome a lot of basic survival problems. That said- we have the cognitive ability to know what we're doing and the likely result- so- we ought to know better.
A lot of us here are willing to do our bit- many are anti-natilists here and we're perfectly willing to go now! All I'm going to do if I stay alive longer is pollute the earth. It's really depressing to be honest but then- I don't feel entirely responsible. Given the choice- I wouldn't have been born to begin with and it's not my wish to be lingering here.