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Sun gives us...

The following non-renewable energy source, coal, can be translated as…

Non-renewable energy is...

Air pollution is caused by...

A machine that turns mechanical energy into electrical energy is called a …

One can collect the Sun’s energy with…

Fossils are...

Water pollution and deforestation are considered as … to wildlife.

Fossil fuels are made of…

Some factories emit harmful … which cause air pollution.