Introduction. Created and produced by QA International. © QA International, 2010. All rights reserved. www.qa-international.com. The rise of air temperatures near Earth 's surface over the past one to two centuries is known as global warming.

Global warming is the long-term heating of Earth's surface observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere. This term is not interchangeable with the term "climate change."

Climate change (sometimes called global warming) is the process of our planet heating up. Our planet has already warmed by an average of 1°C in the last 100 years and if things don't change, it could increase by a lot more than that.
50% of the 33 K greenhouse effect is due to water vapor, about 25% to clouds, 20% to CO2, and the remaining 5% to the other non-condensable greenhouse gases such as ozone, methane, nitrous oxide

The world is now warming faster than at any point in recorded history. Warmer temperatures over time are changing weather patterns and disrupting the usual balance of nature. This poses many

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explanation text about global warming