However, the main substitutes to oil face their own decline rates.

Many economists believe that the free market will substitute one energy source with another through technological innovation.

Many believe that the crisis can be prevented through conservation, technology, smart growth, recycling, electric cars and hybrids, substitution, or voting.

Now there's no question about it at all we will only solve the problem of replacing fossil fuels with technology.

They went out into the field to answer a particular question.

It basically boils down to the Bushehr nuclear power plant and to the Natanz fuel enrichment plant.

They are also limited to sunny climates, requiring large amounts of electricity to be transmitted over long distances.

like fishermen and ships and such things, but hey, we're talking about biofuels, and we know the importance of potentially getting an alternative liquid fuel.

I mean global warming certainly is a massive threat to mankind and we are putting a lot of time and energy into,

And so we thought perhaps there might be a better way to come up with an alternative cooking fuel.

I need fuel.

Primary fuel?

Fuel supply?

Our fuel.

We've got a lot of work to do.

Mine fuel

Primary fuel 2893 KRG.

What is he saying about the fuel?

Fuel cells.

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He told us that Brazil's government mandated that every gasoline station in the country would carry ethanol.

So what I'm telling you about is a system of integrated activities.

The source of fuel crude oil.

Jet fuel.

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Rp7 rocket fuel burns at 5.000 degrees.

Other renewables only generate 2.5 .

Fuel, Skripach, fuel...

It's chemically fueled.

Fuelinjected.

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But I'm not really concerned about the fuel.

In this kind of reactor, you can't do that.

We've talked about the soil erosion.

Petroleum was replacing coal as fuel.

I made a promise that the next time I would fly around the world, it would be with no fuel, independent from fossil energies, in order to be safe, not to be threatened by the fuel gauge.

I can't give you a fuel injection.

Drop the fuel tanks and pull up!

Fill her up.

Like those cars that run on corn.

We're losing fuel.