Greenhouse gas emissions, like CO2, are causing global warming, leading to severe climate change in the 20th century. The US and China are major emitters, together responsible for 40% of CO2 emissions and 35% of all greenhouse gases. Developed and developing nations are responsible for 90% of these gases. Global warming is raising ocean levels, threatening coastal areas by 2050 and risking extinction of insects and animals. To safeguard our future, urgent steps are needed to reduce greenhouse gas emissions and combat global warming's impacts.