Greenhouse gas emissions accounting means that scientists keep track of the amount of gases such as carbon dioxide and methane that are being released into the air from human activities. This helps them to understand how much global warming is happening and what kinds of changes we need to make in order to stop it from getting worse. Scientists measure the amount of gas by studying the air around us, looking at clouds, and even analyzing the sun's rays. They also compare what is going on now to what was happening in the past to see if things are getting better or worse. When scientists have all this information, they can use it to suggest ways for us to reduce our emissions and slow down global warming.