ground water, definition of

A global, three-dimensional computer model of the climate system; GCM's are highly complex and they represent the effects of such factors as reflective and absorptive properties of atmospheric water vapor, greenhouse gas concentrations, clouds, annual and daily solar heating, ocean temperatures and ice boundaries. The most recent GCM's include global representations of the atmosphere, oceans, and land surface.

They are often used to model the effects of human induced climate change into the future; but the accuracy of the models are highly dependent upon:

• The accuracy of the initial starting conditions;
• The accuracy of how the climatic processes are modeled, and;
• The accuracy of the assumptions made in the model construction.

• The facts about Water Tanks
  Water tanks, all the information you need to know about storing water and the best ways to use water around the house.
• Efficient Water Usage and Storage
  How to improve your water harvesting and collection with water tanks and how to use the water efficiently and be ecologically sound.

• California is tapping water that rained 20,000 years ago to deal with epic drought
  California has been making headlines for the gravity of its drought. The Los Angeles Times reported that January was the driest month on record since 1895. Other sites including this one have explained that the Golden State has just one year of water...
• California is pumping water that rained on Earth 20,000 years ago
  California has been making headlines for the gravity of its drought. The Los Angeles Times reported that January was the driest month on record since 1895. Other sites including this one have explained that the Golden State has just one year of water...
• EPA to Provide Clean Drinking Water to Families Near Fracking Sites in Pennsylvania
  In a move that seems to admit the danger of hydraulic fracturing (or fracking) to ground water reserves, the EPA has decided to provide clean drinking water to four families in Dimock, Pennsylvania who say their water supply has been contaminated by a...
• Tech Talk: The Technology of Grouting
  For the last two technical talks I have been explaining how, by bolting rock layers around an opening, spraying concrete on the walls of the opening or a combination of both, one can stabilize openings underground...