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A garden greenhouse keeps the plants warmer then they would be outside. It’s does this because they glass traps some of the sun’s radiation energy. In a similar wau, the sun’s radiation that would otherwise escape. Without this greenhouse effect the average surface temperature would be about 33°c lower than it is – 18°c instead of a nice comfortable 15°c.
Some gases are better than others at keeping the earth warm
Oxygen and nitrogen are not very effective, but carbon dioxide is very good. The earth absorbs visible and ultraviolet (UV) radiation from the sun. The earth re-emits this radiation as infrared (IR). Infrared radiation is absorbed by carbon dioxide making them vibrate faster and increasing their energy. The energy is passed on to other molecules in the atmosphere thus, making the atmosphere hotter.
Carbon dioxide is such a good “greenhouse gas” That there maybe a problem. Scientists are concerned that the human activities are putting so much extra carbon dioxide into the atmosphere that the earth is overheating. The problem is known as global warming. Some of the effect of global warming could be good. In places with good rainfall, farmers will be able to grow bigger crops. But there will be more drought. The level of the sea will rise and this is because water expands when heated, and also because some of the ice at the poles will melt.
Carbon dioxide is not the only greenhouse gas
But it is the most serious one because there is so much of it- so much that there is no chance of removing it, from all the car exhaust, gas boiler and other places it pours from. The only way we can reduce it is to cut down on our use of fossil fuels.
Even if we cut back on using it global warming will continue for years. This is because much carbon dioxide has already been put in the atmosphere from fossil fuels we have burned in the past.