What does this graph reveal about wildfires in the United States over the past 30 years?

Forests supply vital ecosystem services that include all of the following EXCEPT _______.

What often happens when a thermal inversion occurs?

According to the figure, how much has the global average sea level changed since 1880?

Which of the following are the primary indoor pollutants in developed nations?

In general, why does an old-growth forest have greater diversity than a younger forest?

Which pollutant is most likely to impact the health of residents in a particular city?

Ozone in the is a pollutant, but in the , it is vital for life.

Emissions have been reduced in the United States because of _________.

Based on the figure, which statement about the level of tropospheric ozone in photochemical smog is true?