Until human populations soared and began burning fossil fuels, greenhouse gases remained in relative balance. ... Hansen's prediction was correct, "atmospheric aerosols from Mount Pinatubo had a cooling effect during 1992 and 1993. ...

• Word Count: 3357
• Approx Pages: 13
• Grade Level: High School

GLOBAL WARMING Humanity is conducting an unintended, uncontrolled, globally pervasive experiment whose ultimate consequences could be second only to nuclear war. Fossil fuel burning, deforestation, and the release of industrial chemicals are rapidly heating the Earth to temperatures not experie...

• Word Count: 2775
• Approx Pages: 11
• Grade Level: Undergraduate