The use of passive cooling techniques to concentrate solids in water

The world's sources of gas and oil, the most desirable form of fossil-fuel energy, are being depleted. The United States is using oil faster than any other nation in the world but has less than 5 percent of the world's oil reserves. The amount of oil produced in the United States is already decHning. Pakiz (23) predicts that the United States will run out of oil between the years 2050 and 2100. Therefore, it is necessary to utilize other energy sources or to find methods that are less energy intensive for accomplishing tasks. A comfortable standard of living cannot be maintained in the future without a change in current energy-use practices.