You play as a scientist looking to keep the Earth safe from climate change. However, you have very little power to make things happen on your own. All you can do is conduct research and then use that research to suggest changes in climate policy. There are no guarantees that this will work, however. This is because politicians and lawmakers will often disregard science in favor of their own agendas. How long can you keep the earth at a livable temperature?
Sometimes you may need to click the green flag twice.