Carbon dioxide concentrations in the air have increased over the last decade dramatically, and carbon dioxide is the primary greenhouse gas. Given these facts, what have increased over the last decade dramatically among the following options:
- gasoline concentrations
 - Warm air moving into cold air
 - Greenhouse gases
 - treehouse gas concentrations
 - movements in the earth's crust
 - concentrated orange juices
 - genetic diversity
 - greenhouse gas concentrations


 

        greenhouse gas concentrations 