Geothermal: People could build pipes into the ground around volcanoes so when water was pumped down the pipes it would heat up because of the magma’s heat turning it into steam which could be used for heat or for turning a turbine which would turn a generator creating electricity. This would greatly reduce our Greenhouse Gas emissions because we wouldn’t be burning anything but we would get our electricity.
Magnetism: People could build a train that moves by the pushing motion of alike magnets. When the train wanted to stop it would stop by the pulling together motion of opposite magnets. This would eliminate diesel and electric trains because this wouldn’t need fuel and it wouldn’t need electricity to run greatly reducing our Greenhouse Gas emissions.