1. why are scientists concerned about increases in atmospheric carbon dioxide?
Scientists are concerned about the increase in atmospheric carbon dioxide because carbon dioxide enhances the _____-. This ____ leads to global warming.
a. trapped heat
b. atmosphere's ability to transmitir radiation
c. atmosphere's ability to heat
d. albedo of Earth
e. transmitted radiation
2. what is the source of the increase?
a. burning of fossil fuels
b. wildfires
c. fermentation
d. volcanic eruptions
e. burning of nuclear fuel