Dear student,
Green Energy is basically defined as the energy that is derived from natural sources such as sunlight, wind, rain, tides and geothermal heat. Such resources comes under the category of renewable resources that is they can be replenished naturally.
These green resources are better sources of energy than fossils fuels that are non- renewable resources and take millions of years for formation and are getting readily diminished because of increased human activity.
Hence green energy such as solar energy, wind energy plays a major role to conserve the energy resources as well as environment as they are pollution free unlike fossil fuels which release gases that cause global warming in the atmosphere.
Thanks and regards.