Global Warming

Presented By Mrs. Rosheim

What exactly is Global Warming?

Global Warming is defined as an increase in the average temperature of the earth''s atmosphere over time. Our world has warmed by 5 to 9 Fahrenheit degrees over the past 18,000 to 20,000 years. The world's temperature may rise by as much as 12 Fahrenheit degrees by 2100.

How Do We Know Global Warming Is Causing PRoblems?

Satellite data shows a 10% decrease of snow cover since the late 1960s, and the Northern Hemisphere spring and summer sea-ice extent has decreased by about 10% to 15% since the 1950s. There has been a widespread melting of mountain glaciers in non-polar regions throughout the 20th century.

Side Note...

There is a natural greenhouse effect that occurs and is not at issue in the debate over global warming. Without it, temperatures would drop by approximately 30 degrees C, the oceans would freeze and life as we know it would be impossible.)