Most recently, representatives from nearly 200 nations gathered in Paris to fight climate change. Almost every country agreed to limit a rise in global temperatures. They agreed that the world should not get any warmer than 2 degrees Celsius above what it was in the mid-1700s. The agreement says 1.5 degrees is an even better target. This will require nations to reduce their greenhouse gases, like carbon dioxide. Those gases are released from the burning of fossil fuels, like oil and gasoline, and they are blamed for raising the temperature of the planet. As the planet warms, ice melts at the north and south poles, the top and bottom of the planet. This can raise sea levels that flood low areas, like islands. Climate change also brings damaging storms, severe droughts and flooding, and widespread food and water shortages. The agreement is supported by the United States and China, the two biggest greenhouse gases polluters in the world.