Basically, humans use lots of energy for heating, lighting, movement, machines, etc etc. That energy has to come from an energy source. Some sources are renewable, some sources are non-renenwable.
Generally speaking, Non-renewable sources are fossil fuels. These come from underground and are Coal, Oil and Gas. There is a fixed amouint of coal oil and gas in the world and when we have used it all, there is no more. We cannot 're-new' them.
Renewable sources are energy sources that will not run out. They can be used 'forever'. They include Solar Energy; Wind Energy; Wave Energy; Geothermal energy.
Fossil Fuel cause lots of pollution. Renewable energy sources don't cause pollution.
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