We know the major reasons for climate change in the past, and we know now that climate change at this time is being caused largely by we humans burning fossil fuel. The isotopes of carbon dioxide in the atmosphere show this. And we know what the other major forcings are - and only the increased level of carbon dioxide and explains what the data show.
What Is This “Polar Vortex” That Is Freezing the U.S.? | Observations, Scientific American Blog Network
