One of the key items on the agenda at the climate summit set to take place next month in Copenhagen is the cap and trade system. The idea is to put a price on carbon emissions so countries with limited industry can offset those with massive CO2 output.

These carbon credits are already being traded on special markets around the world. It's a good concept in theory, but many people think the price to release a ton of carbon dioxide is much too low. Now an environmental group in Germany has come up with a plan to change that.

Report: Richard Fuchs/Vanessa Johnston