Almost 200 countries have signed a historic deal together in Rwanda to effectively phase out the use of HFCs (hydrofluorocarbons used in refrigerators and air-conditioners). HFCs are particularly dangerous to the environment because they can trap thousands of times more heat than CO2. With this step we can now easily prevent a rise of about 0.5 degrees Celsius in global temperatures and get much closer to our target of ending global warming.