There's plenty of easy-to-find evidence out there that shows that the speed and magnitude of these changes are not only unprecedented in human history, but geologic time scales as well. It's also crystal clear that these changes are caused by the massive increase in atmospheric CO2 concentrations caused by humans burning fossil fuels. This is sorted by both theory and massive amounts of evidence. Good primers exist all across the web, http://climate.gov/ is a good starting point.
"But wait, maybe this is all just natural cycles" is borderline willful denial at this point, especially on a well-informed site like HN.
Might as well ask if maybe the earth is flat after all.
"But wait, maybe this is all just natural cycles" is borderline willful denial at this point, especially on a well-informed site like HN. Might as well ask if maybe the earth is flat after all.