The Black Plains wrote:Neither: Uncertain. With no proxy data we cannot be sure if it is our fault.
this is wrong a lot for being so short. i mean, first off, we have tons of great proxy data. but even if we didn't, we could still know that climate change is anthropogenic. we do not believe that CO2 is a driver of climate based on historical evidence, but on its chemical properties. we do not know that there has been a lot of CO2 being emitted by comparing it to the past, but by knowing what happens when you burn fossil fuels. we do not know what the various other drivers of climate are doing currently by what sediment layers tell us, but by actually measuring them now.