PARIS, FRANCE - World leaders in Paris have agreed on a draft climate change plan at the 21st Conference of Parties (COP 21).
Leaders think the history-making proposal, which requires action from every country whether rich or poor, will lower planet-warming greenhouse gas emissions to slow global warming.
Under the Paris agreement, countries will keep temperatures from rising 2-degrees Celsius (or 3.6 Fahrenheit) between now and the year 2100.
President Obama says the agreement, "Offers the best chance to save the one planet we have." UN Secretary General Ban Ki-moon said, "We must protect the planet that sustains us."
Countries will limit greenhouse gases emitted by humans to the same level that Mother Nature can absorb.
Participating countries must agree by consensus, but some nations may decide to ignore the treaty.