The researchers created a computer simulation to study how global carbon trading affects the environment. They used a special kind of modeling called agent-based modeling. The simulation looked at different situations to see how they affected the market for trading carbon emissions. Here are the main findings: 1) Developed countries like the US might struggle to meet their carbon emission targets due to high historic emissions. 2) As more countries want to lower their carbon emissions, the price of carbon will go up. 3) Carbon trading helps move money from richer to poorer countries. 4) Even with trading, rich countries still have higher carbon emissions per person. 5) Trading carbon can benefit the world's overall well-being.