Our planet?  It could care less.  It's "seen" worse.... Even worse than this human experiment it is currently conducting.

I know the green crowd likes to deflect the question of the massive subsidies its renewable resources get without addressing the efficacy and true cost of those resources, but really... can't you own up to their cost and question the cost/effectiveness of large scale wind/solar.

Note that the US cut its carbon dioxide emissions dramatically, not from renewables but from natural gas' displacement of coal.

If you really want to reduce carbon emissions, embrace natural gas shale development, fracture stimulation technologies and nuclear energy.