The article discusses ways to help deal with climate change by being flexible. It talks about different ideas like joint projects, trading emissions, and clean development. The researchers looked at how these plans might work in places like Germany, Russia, and Indonesia. They found that some ideas, like joint projects, might be better for some countries than others. They also explored new ways to account for greenhouse gases and talked about ideas for future plans to help fight climate change, even after the Kyoto Protocol.