The COP21 conference is taking place in Paris to discuss climate change as an international problem. Nations are meeting to address issues caused by climate change like melting glaciers raising sea levels and natural disasters becoming more frequent or intense. Solutions discussed include transitioning to renewable energy sources like wind and solar instead of fossil fuels and promoting energy efficient technologies and transportation options. Inventions being explored for the future include wind turbines on the ocean floor, sailing cargo ships powered by kites, and space-based solar panels.