Greenhouse Effect

	Sun's Radiation
	Reflected Radiation
	Atmosphere

The levels of CO2 and methane are slowly rising. These gases thicken the atmosphere, reducing the amount of energy radiated by the Earth's surface and keeping it warmer than it would be otherwise.

Increased levels of these gases may be causing the enhanced greenhouse effect. An increase in the Earth's temperature may cause:

A big change in the Earth's climate
Increased sea level - flooding low-lying areas

So what may be causing the enhanced greenhouse effect? An increased cattle population, releasing methane, and the burning of fossil fuels, releasing CO2, are thickening the atmosphere.