Q: Fact 1: Adrought can change the color of an environment from green to brown. Fact 2: Too little rain causes a drought. Given the two facts above, what can change the color of an environment from green to brown?

Choose from: (1). harmful substances. (2). clouds. (3). Greenhouse gasses. (4). blizzards. (5). deforestation. (6). Greenhouse gases. (7). blue skies. (8). too little rain.
A:
(8).