Or the planet is going to be spitting us out soon.
There is an interesting circle called photosynthesis/respiration. Coincidentally, the reactions are reverse.
Our planet is set up dancing a line of factors. Change the factors, change the dance. If anyone wishes to dispute the idea that we have made significant changes in the planet's balance - ok, I suppose. Our significance is none. We are one of millions of species.
I find it interesting, if you wish to use C02 as the trigger, that no government body has said plant trees until now. It is always - conserve, find better sources of energy, recycle... If one looks at the CO2 curve on an annual basis, there is a crazy drop every spring when the leaves come out. Make the connection.
The system must remain stable or bad things are going to happen.
Species diversity is a great discussion. Fundamental for maintaining a balance. I really do not wish to have no options - more like my kids having no options.