Greenhouse Gases, Feedbacks and Scenarios

• The relationship between increasing amounts of GHG (green house gases) and GCC (global climate change) is becoming clear to people who understand scientific methods and math. As GHG volumes in the atmosphere rise, temperatures rise. The number of feedbacks (ie. the positive and negative effects of clouds and  aerosols, ocean currents, ice and precipitation) as discussed on   NASA's Climate Uncertainties page make it difficult at best to predict how fast negative consequences may occur. Another discussion of the problem can be found at the NOAA Paleoclimatology site. (The NOAA website has a great list of references such as Teachers' Manual to Global Warming: Understanding the Forecast, too.)
• Climate models are useful to help predict what will happen to the climate system as one or another forcing changes, and how it will affect the other parameters involved. (NASA Goddard Institute for Space Studies Global Climate Modeling Page ) Models for GCC are incredibly complicated and are constantly being updated by better computer software and hardware.
• The IPCC emission scenarios serve as arbitrary models to predict the climatic consequences of changes in two or three human-controlled parameters. The scenarios were developed in 2000, so they are a decade plus old, and we should be able to see which parameters have held true in the last 10 years, and whether any scenario came close to predicting the small slice of data the last ten years represents; ideally we could introduce a scenario like A2 and add the Balanced energy piece that the A1B scenario has in order to reflect the increased use of alternative energy sources.