You are shopping for a newer-model smartphone. At the store, the salesperson tells you if you trade in your old phone, you can receive a discount on the newer model. This is an example of:

Which of the following is NOT a way to reduce indoor air pollution?

Tropical rainforests have thin, acidic soils, yet they contain dense vegetation and high biodiversity. How can these tropical forests have poor soil and support such a diverse array of life?

What does the 1977 U.S. Surface Mining Control and Reclamation Act mandate?

 In subsurface mines, more miners die of ___________

A tropical rain forest has more different kinds of trees than the same area in a boreal forest. Which of the following is true?

With more energy-intensive production methods, the EROEI goes _____, and the cost goes _____.

Approximately what percent of U.S. streams and rivers meet the fishable/swimmable goal?

One of the first environmental laws passed in the United States to regulate pollution was the ___________

How many years are the total world conventional reserves of natural gas are expected to last?