With many politicians and atmospheric scientists concerned about global warming, a few of them are now offering theories to fix the problem. Here are two of the more radical plans recently suggested.

German scientist Paul Crutzen is a researcher at the Max Planck Institute for Chemistry, and is actually a Nobel Prize winner. His solution is to inject sulfur particles into the upper atmosphere. This would reflect a portion of the sun's energy back into outer space, which would cool the planet. This theory would work in much the same manner that a volcanic eruption cools the planet. When Mount Pinatubo erupted in 1991, the global temperature fell by 1/2 degree Celsius. Sulfur particles launched into the stratosphere would remain up there for 1-2 years before settling back to Earth. Crutzen suggest launching the particles into the atmosphere with either high altitude balloons or artillery shells. His theory would cost $25 billion-$50 billion to release enough sulfates for two years.

Another global warming fix is from Charles Harvey, an associate professor at Massachusetts Institute of Technology. He is suggesting storing liquefied carbon dioxide at the bottom of the ocean. There are already plans to store CO2 in underground storage facilities, but on land they leak, and the CO2 will eventually get back into the atmosphere. Liquid CO2, stored at the bottom of the ocean is denser than water, and because it is so cold, it would seal itself with a solid ice like dome. This would be a permanent storage place for excess CO2. It is estimated that the total CO2 produced by the U.S. in a year can be stored in an area of 80 square kilometers, and the U.S. has enough seafloor within it's territory to store excess CO2 for thousands of years. There was no estimate on how much this would cost.