• Global energy use is still dominated by non-renewable energy. The use of non-renewable energy can be made more efficient. This could increase energy supplies as less fuel would be used.

Fossil fuels

• Coal and gas power stations can now re-use wasted heat in. These are called combined-cycle systems.
• Re-using heat makes the most out of the fossil fuels.
• Also, some power stations now burn small amounts of biomass alongside fossil fuels. This is called co-firing and it makes the fossil fuel last longer.

Fracking

• Hydraulic fracturing, or fracking, is a process that uses high-pressure fluid injections to shatter rock formations and extract natural gas. Fracking has been blamed for leaking millions of tons of methane, a greenhouse gas more potent than carbon dioxide.

Nuclear:

• In physics notes
• Uranium fuel rods still have some uranium left within them after they have been used. Reprocessing recovers the uranium from spent fuel rods so that it can be reused. This doesn't create new supplies of uranium, but it does use the existing supplies more efficiently. This means that uranium supplies will last longer.