Carbon dioxide concentrations in the air have increased over the last decade dramatically, and carbon dioxide is the chief culprit in the increased threat of global warming in recent decades. Given these facts, what has led to the increase in global warming among the following options:
- Greenhouse gases
 - movements in the earth's crust
 - Increase in carbon dioxide
 - Greenhouse gasses
 - forest is destroyed
 - Burning fuel and air
 - movement of tectonic plates
 - tectonic plates being pushed together


 

   Increase in carbon dioxide      