As a thought on climate change. It has always happened and will continue to happen as the cyclic nature of earths climate over time, (hot cold hot cold ice age, flood heat etc)
Yes we are accelerating it, yes we can do something about our contribution to it, yes we need to do it now.
Now for reality check folks, we can only have an affect on our contribution, the effect of nature's cyclic climate will cause our extinction, we can stave it off for a few decades, but nature will win and we will all die. It's a case of when not IF.