Our atmosphere has a mixture of gases including nitrogen, oxygen and water vapour. There are also small quantities carbon dioxide, methane and other gases called "trace" gases.

The Greenhouse Effect happens when Sunlight passes through the atmosphere, warming the earths surface and the land and oceans give off heat, into the atmosphere, this balances the heat energy. Water vapour, carbon dioxide and some of the other trace gases can absorb part of this heat. This lets it warm the lower atmosphere, while the rest of it is let out to space. This keeps the surface of our planet warm enough to sustain us, Without gases trapping heat greenhouse gases the surface would have an temperature of -18C right now we have a average of 15C. When of the atmosphere gases increas over the normal amount they call this the Enhanced Greenhouse Effect.

When the idustrial revolution around 200 years ago, we have been pumping more and more carbon dioxide gas into our atmosphere. This is makeing the layer hetcker and thecker Today, of this gas is approximately 28 per cent greater than in the 18th century. Most of the increase in carbon dioxide comes from burning of fossil fuels such as oil, coal and natural gas. Globally, human activities are adding about 26,000 million tonnes of carbon dioxide into the atmosphere each year.
By the end of the 21st century, average world temperatures are likely to be between 0.8C and 4.5C higher than now. The mid-range estimate for the year 2100 is a warming of 2C. Climate models show that land will warm more than the sea. The daily temperature range over land is likely to decrease. The greatest warming is expected to occur in the sub-polar regions of the northern hemisphere during winter, due to melting of ice and snow. Average rainfall across the globe is going to increase.

If the earth's atmosphere warms, the upper layers of the oceans will also warm. Like most substances, water expands when it is heated. Expansion will raise sea level. Land based ice in the temperate regions of the world like South and North America and Greenland will melt more. Melting will also contribute to increased sea level.

When reason to slove or a least slow down the greenhouse effect is to plant more tree's and stop cutting down the worlds forests. Growing trees, take's the CO2 out of the air and replace it with oxygen. The carbon is held in the wood fibre and will stay there until lost slowly as the wood rots, or rapidly as the wood burns. Reducing use of fossil fuels would reduce the amount of carbon dioxide produced, this will bring down the levels of the pollutants which cause acid rain. You can help stop the ozone layer by trying to be the most energy-efficency. You can do this in many ways such as turning off lights when they are not being used. You can also walk or ride a bike instead of driving a car when possible. One of the biggest is to recycle all of your paper, cardboard, glass, and metal. If we can reuse stuff we will not have to cut down more tree's to remake the idems