1
is heat derived within the sub-surface of the earth,can be used for heating and cooling purposes or be harnessed to generate clean electricity.
2
is energy that has been derived from Earth's natural resources
3
is derived by capturing radiant energy from sunlight and converting into heat, electricity or hot water
4
is the use of wind to provide the mechanical power through wind turbines to turn electric generators and traditionally to do other work, like milling or pumping.
5
is organic matter that comes from recently living plants and organisms
