Our planet is warmer now than at any point in the past 1,000 years, and levels of planet-warming greenhouse gases have rocketed in the past 100 years. This is largely due to humans burning coal, oil and gas, and cutting down forests. If we don't stop doing these things, the planet will continue to heat up. Each degree of warming will bring more extreme weather, placing communities across the world at risk of wildfires, floods and droughts. Its time to think seriously