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Energy
Renewable energy is energy that can be regenerated, and comes from inexhaustible natural sources (like solar, wind, and water).
The problem is non-renewable energy
uses limited natural resources.
It took millions of years for the earth to produce these natural resources. Once they are consumed they can't be easily recreated.
fuels
Coal, petroleum, and natural gas represent almost 90% of the commercial energy used in the world.
Energy is obtained by burning these limited natural resources (coal, petroleum, and natural gas).
This produces large amounts of carbon dioxide and other polluting gases, which
are emitted into the atmosphere.
fossil fuels
matter?
Burning fossil fuels causes carbon dioxide to accumulate in the atmosphere, contributing to global warming.
Once carbon dioxide enters the ocean it reacts with seawater to form carbonic acid.
If humans continue to source power from fossil fuels, what will happen to the earth?
Burning fossil fuels increases emissions of CO2, causing Earth's temperature to rise, contributing to global warming.
CO2 emissions have doubled since the 20th century.
solution
Here are a few energy solutions to help stop global warming. By reducing fossil fuel use we can start to repair our planet.
Remember: Every little bit counts!
Photovoltaic solar energy is the direct transformation of solar radiation into electrical energy.
When sunlight (photons) shines on the solar cell it generates an electric current.
This electricity generated can then be used as a source of energy.
Solar thermal systems capture thermal energy using solar radiation for heating solutions such as heating buildings, water, and swimming pools.
This method can save approximately 1/3 of total energy use.
Geothermal energy is heat derived from sub-surfaces of the earth. Various resources can be tapped for geothermal energy, such as shallow ground, hot water, hot rock located below the earth's surface, and deeper locations that house molten rock (magma).
Wind energy creates electricity by using air flows or wind that naturally occur in Earth's atmosphere.
Wind turbines harness this energy and generate electricity using aerodynamic force created by rotor blades (kinetic energy) much like a helicopter rotor blade.
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