Today's energy is fossil

Fossil fuels are coal, petroleum and natural gas. They are not renewable, once burnt they are gone forever.

These sources supply more then 90% of our energy requirement.

In this context two problems are paramount. One problem is the question for how many years these fuels will be available. The other problem is the pollution caused by burning fossil fuels.

That's why we subdiveded the fossil chapter into two subchapters: Climate and Resources.