No kids here either. Apart from that, not a lot. I believe that the human race is the only problem this planet has. Stop all this talk of saving the planet, the planet will be fine. What most people really mean is " save the greedy, selfish human race from extinction". Once we are gone, the planet will recover and thrive for billions more years, when we will be a distant and brief memory.
Pity about all the collateral damage we have caused to innocent other species though.