How is greenhouse gas affecting the forest and the earth?

Greenhouse gases keep the planet warm, and have done for millions of years.

Too much greenhouse gas, like extra carbon dioxide, causes accelerated climate change. Forests and the earth may be affected by changes in climate and other possible results. The Amazon Rainforest suffered severe drought in 2005 and then worse in 2010. Millions of trees died. This might have been an effect of global warming.