4.) green energy sources petroleum and coal can meet the energy demands of the united states for decades to come, but are causing costly climate changes locally and globally due to emitted co2 a.) what are some of the benefits of burning hydrogen (h2) for energy to run your car, to provide electricity, and/or to heat your home? be specific. hint: do some research. (4 points) b) where can you get h2? how can you make it? (4 points) c.) what are some risks of converting to a h2 economy? (2 points)