Greenhouse gases present in the atmosphere soak up heat that is rising up from the earth surface causing it to be retained. This greenhouse behaviour of the atmosphere acts as a natural blanket over the earths surface making it warmer than it would otherwise be.
Without this effect the earths surface would be 20 to 30°C colder and much less suitable for life. However, man is upsetting the balance of greenhouse gases in the atmosphere & causing changes to this blanket effect.
This in turn leads to global warming and as a consequence will affect other aspects of the Earths climate; Climate change. Even if all greenhouse gases had been stabilized way back in the year 2000, we would still be committed to a warmer Earth and greater sea level rise in the present century because of all the pollution created in the past.
Rising global temperatures are expected to raise sea level, and change local climate conditions. Changing regional climate could alter forests, crop yields, and water supplies. It could also affect human health, animals, and many types of ecosystems.
If some of these words are a bit confusing check out the Glossary Here
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