• Energy can take the form of electricity, heat, movement or radiation.
• Energy sources can be divided into renewable and non-renewable.
• Most of the planet's energy is produced with fossil fuels.
• Fossil fuels include oil, coal, natural gas, and shale gas.
• Fossil fuels cause climate change.
• Nuclear power is an effective energy source, but it also has its risks.
• Renewable energy sources include solar energy, wind power, water power, bioenergy, geothermal energy and geothermal heat.
• The largest energy consumers in the world include China and the United States.
• The largest energy producers in the world include the United States, Russia, Saudi Arabia and China.
• Key words: renewable energy sources, non-renewable energy sources, fossil fuels, climate change, oil, coal, natural gas, shale gas, nuclear power, water power, solar energy, wind power, bioenergy, geothermal heat, geothermal energy.