Opponents say it is deeply flawed for its emphasis on traditional fossil fuels.

He called shredded tires "a better value to the buyer" than traditional fuel, at one-third to one-half of the cost.

In urban areas, this traditional fuel constitutes about 24% of the total.

Renewable energy sources are even larger than the traditional fossil fuels and in theory can easily supply the world's energy needs.

The traditional fuel is wood, since smoke is the very essence of barbecue.

Since there are no hydrogen wells, it must be extracted from traditional fuels like natural gas, ethanol or petroleum.

The longer range has been used by some airlines to bypass traditional fuel stops, such as Anchorage.

Biofuels will not be competitive, compared to traditional fuels, without separate tax concessions.

The car was powered by both traditional fuel and hydrogen.

On the basis of research, hydrogen appears to be the ideal alternative to traditional fossil fuels.