Microwaves are actually more eco-friendly than conventional ovens. Even a press write up on the new study stated, “An individual microwave uses 573 kilowatt hour (kWh) of electricity over its lifetime of eight years. That is equivalent to the electricity consumed by a 7 watt LED light bulb.”
Microwaves can use up to 80 percent less energy than conventional ovens, so they are a green way to warm leftovers and steam vegetables. To cook food in the microwave even faster, place it on the outer edges of a rotating tray rather than in the centre.