Ppm Quotes

We run enormous risks and we know what kind of reductions of greenhouse gases are necessary to drastically reduce risks. Reducing emissions by half by 2050 is roughly in the right ballpark. It would bring us below 550 ppm. (Nicholas Stern)
So what's easier to believe as the cause of climate change? That a trace gas called CO2 that has increased on earth from about 280 PPM to 380 PPM in the last 100 years is the cause, or that the giant nuclear fireball a thousand times bigger than earth a mere 8 light-minutes away has been getting more active during the same period is the reason? View quote
Anthony Watts