In the European Union, they have this plan to reduce greenhouse gases by 8% from 1990 levels by 2012. They use something called the Emissions Trading Scheme (ETS) to make companies pay for their emissions. Some smart people looked at how economic growth, energy prices, and weather affect the prices of these emissions permits from 2005 to 2009. They found that the prices for these permits are starting to settle down and be more stable in Phase 2 of the ETS. This means that the market for these permits is getting better at setting fair prices based on important factors like the economy and weather. These findings can help traders and policymakers make better decisions about how to manage emissions in the EU.