1. Global Warming
We only have temperature data from the past 150 years, which is a very short period in global terms. ... However, data does show that the earth's average temperate has increased about 1F over the past century. ... Global warming is thought to be caused by a process called the "greenhouse effect."" ... The gases accumulate and disrupt the natural greenhouse process. ...
- Word Count: 640
- Approx Pages: 3
- Grade Level: High School