The article discusses how human activities are increasing greenhouse gas emissions, which are causing climate change. It suggests that an effective way to reduce these emissions is by putting a price on carbon, like through taxes or trading permits. The researchers say there are still disagreements about the economic impacts, fairness, and political actions needed to address climate change. But most experts do agree on the urgency to act now based on strong scientific evidence. They claim that all countries, including developing ones, must work together as global warming affects them the most and their emissions are catching up to richer countries.