All we need to do is convince Isis to put catalytic converters on their vehicles or convince India to use smart cars...maybe China will will put filtration systems on their child labor sweatshops. Maybe all the far left liberal Hollywood types will park their jets and tour buses and start using bikes. Only humans are that arrogant to think we have that much impact. We aren't even a pimple on the earths ___ in the grand scheme of things. Does anyone know the long term effect of covering the earth with solar panels? No? Didn't think so.