[ 21st century skills library ]
4
I n t r o du c t i on
What Is
Renewable Energy?
R
enewable energy is becoming more and more important.
Renewable means it can be used again. These energy sources
can continue to power cities forever.
Nonrenewable fuels
, also
known as
fossil fuels
, do not work this way. Once that fuel is
used up, it is gone.
