Fact 1: Adrought can change the color of an environment from green to brown.

Fact 2: Drought, or a lack of water, is often a problem for farmers and communities around the world.

Given the two facts above, answer the question "what can change the color of an environment from green to brown?" with the following options: 
- lack of water
 - clouds
 - trees
 - increased h2o
 - climate
 - deforestation
 - burning
 - Greenhouse gases


 

 lack of water        