Why is it so difficult to answer three simple climate questions?

[True Federalist (진정한 연방 주의자)]

CO₂ levels aren't the only variable in climate models.  For instance, particulate matter and SO₂ in the air, especially the upper atmosphere is also important as they increase reflectance and thereby cool the Earth.  Indeed, one of the proposed methods of cooling off the Earth is to deliberately introduce particulate matter.

Looking at only CO₂ and temperature levels and trying to draw conclusions is bad science, whether one is a believer or a skeptic in global warming.