Question

7. carbon dioxide is a colorless odorless gas why is it considered a pollutant?

A. it gets into natural waters and kills fish

B. it promotes algal growths in natural waters

C. it causes respiratory illness in humans

D. it increases the warming of the atmosphere

Answer 1

D?

Answer 2

hmm okay im not sure...

Answer 3

Hi,
It's " D " . read the following article and u will come to know y
http://online.wsj.com/article/SB124001537515830975.html

hope this will help ya!

Answer 4

Thank you!