4. Which of the following statements is true of environmental quality?

a. It is typically not affected by government policy.

b. Other things equal, it tends to improve with economic growth.

c. There is broad scientific consensus that rising levels of carbon dioxide and other gases are raising the planet’s overall temperature.

d. Most economists believe it is not possible to reduce greenhouse gas emissions while economic growth continues.

e. Most environmental success stories involve dealing with global, rather than local, impacts.