Environmentalists and scientists advocate immediate intervention regarding global climate change because_________ .

The most recent analyses of polar ice cores have given us the ability to profile global climate change back as far as   ____years.

Wind energy has been harnessed for hundreds of years to______

Surface impoundments are _______.

Acid mine drainage often contains heavy metals

The reason that the natural gas EROI has gone from 30:1 in the 1950s, 20:1 in the 1970s, and 11:1 currently is due to the fact that:

Wind turbines are considered a risk to the environment due to:

Which of the following is the most cleanly burning fossil fuel available, producing the least carbon dioxide per unit of energy released, as well as having the lowest levels of PM production, and lowest nitrogen and sulfur containing compounds?

The greenhouse effect involves warming of Earth’s surface and the ______.

Crude oil is_____ .