Huge disparity in greenhouse gas production between developed and developing countries. Because of the dynamics of global warming, policy options are limited. The Kyoto Protocol is dealing with the potential use of international tradable permits. It is based on computer models. As computer models only simulate, many people give no credence to the theory.
Computer models are inaccurate and imprecise.
They are not at the point where we can rely on them for the things were relying on them for in predicting global warming. Yet any policy that deals with global warming will ultimately be based on a computer model. Monitoring the earth's temperature is difficult because of the lack of standards historically. Global warming measurements are often taken at the Mauna Loa Observatory in Hawaii. Some models indicate that global warming is largely Northern Hemisphere and polar phenomena.