(First 5 of 10)
3. The Earth (and its carbon cycle) is too big for humans to affect it.
During 1850-2000, through a combination of fossil fuel burning, cement manufacturing, and land-use changes, humans added a net 174 Gt of carbon. This caused the majority of an increase from 288 ppm (parts per million) to 369.5 ppm of CO2.
Without human influence, this regulatory process produces a net carbon increase of 0.0 Gt/year.
4. The sea level has not changed.
Since 1900, sea level has risen by about 35 cm (13.8 inches). This change in sea level is accelerating.