While Johnson looks at Vermont specifically, the background information applies ... over states' rights and EPA rulings. Basically, CO2 emissions can't be reduced unless fuel economy is improved.

The contribution to the greenhouse effect is expressed in greenhouse gas equivalents (CO2 equivalents). One greenhouse gas equivalent is defined as the effect of emission of 1 kilogram of carbon ...

It provides an important background to what is coming — a transformative change for carbon emissions. In the 1970s and early 1980s, Chevron CVX led an EOR project in the Permian basin.