Global warming is defined as a gradual increase in the average temperature of the Earth caused by greenhouse gases. The document outlines several effects of global warming such as sea level rise, extreme weather, and impacts on food production. It discusses COP22, which is the decision-making body of the UN Framework Convention on Climate Change, and Greenpeace's goal to protect the environment. The document concludes by suggesting actions individuals can take to address global warming such as speaking up, using clean energy, reducing food waste, and buying energy-efficient light bulbs.