A nation that can’t control its energy sources can’t control its future.

Energy is essential to life and all living organisms. The sun, directly or indirectly, is the source of all the energy available on Earth.

Out energy choices and decisions impact Earth’s natural systems in ways we may not be aware of, so it is essential that we choose our energy sources carefully.

The true cost of energy is more than just dollars and cents; there are important economic, political and social factors and consequences to consider as well.

In the united states and many other countries, most energy sources for doing work are nonrenewable energy sources:

• Petroleum

• Hydrocarbon gas liquids

• Natural gas

• Coal

• Nuclear energy

These energy sources are called nonrenewable because their supplies are limited to the amounts that we can mine or extract from the earth.

The major types or sources of renewable energy are:

• Solar energy from the sun

• Geothermal energy from heat inside the earth

• Wind energy

• Biomass from plants

• Hydropower from flowing water

They are called renewable energy sources because they are naturally replenished.

Energy resources: Energy is the capacity to do work and is required for life processes. An energy resource is something that can produce heat, power life, move objects, or produce electricity. Matter that stores energy is called a fuel.

Human energy consumption has grown steadily throughout human history. Early humans had modest energy requirements, mostly food and fuel for fires to cook and keep warm.

In any event, the exploitation of all energy sources with the possible exception of direct solar energy used for heating, ultimately rely on materials on planet earth.

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