Potsdam, Germany – German scientists called Tuesday for the world to accept per-person quotas for carbon dioxide emissions to kick-start a global trading scheme where poor nations will benefit. The Potsdam Institute for Research on Climate Effects said everyone on the globe should be allowed 5 tons of carbon per year. That is just one quarter of the average per-person emissions for a US citizen, but still far above emissions in poor nations. The government-funded institute said the current arrangement, in which some nations have made voluntary commitments to cut emissions, would not work. The institute says the world needs an effective way to hold global warming to no more than 2 degrees. Hans Joachim Schellnhuber, director of the Potsdam Institute said voluntary cuts agreed last year at the Copenhagen climate summit would still allow the global climate to become more than 3 degrees warmer by end of this century. A scheme with worldwide per-person quotas would allow poor nations to sell part of their quotas to rich nations. Nations such as the United States have very high per-person emissions partly because of high fuel use by industry and government services.