Quite often in nature problems just take care of themselves.
Frankly I don't see that humans have been particularly beneficial to the Earth and I've never seen a scrap of evidence that shows we are capable of globally uniting to the degree necessary to fix our current problems. Sure, we are one of, if not the most, intelligent creatures on Earth, and we've always been great at manipulating our environment and taking advantage of Earths resources to our own end, but having that superior intellect and resourcefulness doesn't mean we've been particularly virtuous or admirable about how we've gone about it. As a species we have always altered and raped the land where ever we've gone, but because of our previously small population in the past we've had a much smaller effect and the land had the time and opportunity to recover. However, it's this same "intelligence" and resourcefulness that has allowed our population to grow beyond what the Earth can naturally support. We've been on this track and going in this direction for all recorded history. It's taken centuries for us to get here and we are going faster than we've ever dreamed possible. The problem is that all the time we were moving along on this train, feeding the engine and designing and engineering new ways to make it go faster and faster, we never took the time to install a proper braking system.
Given human nature and the speed at which we are traveling, it's highly unlikely we will ever stop this industrial locomotive we are on on our own.
The Earth's climate has experienced large fluctuations in it's temperature since it's existence. This has no doubt led to the extinction of many species of life that could not cope with climates changes that became too hot or too cold for them. Still, life on Earth continues to survive.
Barring any divine intervention,there is plenty of evidence though that CO2 levels are rising because of human industry, and that it will have eventual repercussions on our environment. With that in mind, it seems to be unanimously agreed that the human population on Earth has grown too large and continues to grow out of control and this is really the main cause of the rising CO2 levels. It's also agreed that global warming, climate change, whatever you want to call it, will eventually have a serious negative effect on the human population which is really what is at the heart of this problem in the first place.......
I think it's just a mater of time until the train we are on derails and the problem "naturally" takes care of itself.
If survival on Earth was played like the reality TV show and all the species on Earth were able to take a vote which species to kick off this island, humans would be the first to go.
In the long run, "scientifically" and statistically it's been shown that the Earth will eventually succumb to one natural disaster or another. And it's also "scientifically" impossible for us to leave our solar system to find another habitable planet. So for our sake lets hope there really is a benevolent almighty creator watching over us that plans to save our sorry asses, because "scientifically" we're screwed.