Adrought can change the color of an environment from green to brown, and lack of rain last winter has intensified Arizona's drought. Given these facts, what can change the color of an environment from green to brown among the following options:
- lack of rain
 - deforestation
 - precipitation
 - Greenhouse gases
 - climate
 - h2o
 - forests
 - swamp vegetation


 

 lack of rain        