Environmental Science Question
View this question.
Add this question to a group or test by clicking the appropriate button below.
- has been stable over the history of the planet
- is changing as a result of natural and human processes
- will stabilize over the next century, according to the predictions of most scientists
- has changed only once due to the evolution of green photosynthesizing plants
- history is undeterminable because there is no method of studying climatic history of the planet