Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 546)

Change: Tips 4 Teachers deg C, degrees Celsius: The measure of temperature used in scientific papers about climate change. One deg C is equal to 1.8 deg Fahrenheit.ppm, parts per million: The standard form of measurement for CO2 and other greenhouse gasses in the atmosphere.   View changes from previous version. (Word count: 503)

Change:  greenhouse gasses. Early models showindicate that aggressive use of an orbital screen or a high-altitude injection process wouldcould allow us to maintain a fairly constant global average temperature in this century, but at the cost of reduced total rainfall.rainfall and other side-effects.   View changes from previous version. (Word count: 497)

Change:  increase in temperature due to increased greenhouse gasses. Early models show that an orbital shield or a high-altitude injection process would allow us to maintain a fairly constant global average temperature in this century, but at the cost of reduced total rainfall.   View changes from previous version. (Word count: 490)

Change:  cold weather: sunlight entering through the glass is absorbed by the soil and reradiated as infrared energy, which is trapped and reflected back to the winter.soil by the glass, keeping the greenhouse warm.Greenhouse gas: a gas that contributes to the   View changes from previous version. (Word count: 283)

Change: Farenheit.Farhenheit.ppm, parts per million: The standard form of measurement for CO2 in the atmosphere. While parts per million may seem like a small amount, here   View changes from previous version. (Word count: 248)

Change: the last ice age had CO2 levels of about 85 ppm, in 1500 AD CO2 was at 290 ppm, and 50 million years ago CO2 levels were 3500 ppm, which was enough to allow temperate forests to grow on Antarctica.[I’dAntarctica; putthe itlast as reallyice low   View changes from previous version. (Word count: 248)

Change: Renamed from Terms by FutureoftheUS Sep 24 2008, 11:41 PM EDT for: Rename

Change: Restored by FutureoftheUS Sep 24 2008, 9:38 PM EDT for: no reason given

Change: Created by FutureoftheUS Sep 24 2008, 9:33 PM EDT for: no reason given