### fuel:

Alcohol fuel
* are a means of harnessing bioenergy.
* burn cleaner than regular gasoline and produce less carbon monoxide.
* have high octane.
* lose one-half gram per mile per vehicle less than conventional gasoline vehicles.

### fuel:

Alternative fuel
* are an abundant renewable resource
  - capable of reducing emissions and can make good business sense as well
  - far from perfect substitutes for oil
* are important for air quality and for conserving natural resources
  - to our nation's energy security
  - substantially non-petroleum
* are the future, a way to reduce emissions and increase efficiency
  - long-ignored path to a sustainable future
  - wave of the future
* can potentially reduce emissions associated with standard diesel fuel.
* have benefits that go beyond their improvement of air quality.
* help the environment by emitting fewer air pollutants.
* produce less air toxins and ozone-forming emissions than gasoline.

Aviation fuel
* is fuel used exclusively for the operation of aircraft.
* is the cheapest fuel in the world because it is tax-free
  - only liquid fuel today still using lead

### fuel:

Biomass
* All biomass is composed of sugars, starches, and cellulose.
* Most biomass consists of materials
  - enhances growth
  - goes to roots rather than synthetic material
* Most biomass has effects
  - population variation
  - productivity
  - provides food
  - used today is home grown energy
  - uses energy
* Some biomass contains pollutants.
* Some biomass enters detritus pools
* Some biomass increases algal production
* Some biomass is consumed by crabs
  - mud crabs
* Some biomass provides habitats
  - nutrition
* Some biomass uses for electricity
  - generate electricity
* accounts for as much as two-thirds of total African final energy consumption.
* burning is an example of a critical human initiated activity affecting the troposphere
  - the burning of vegetation
  - major factor responsible for changes in soil chemical properties
  - occurs primarily in the continental tropics
* decreases at each ascending level of the food chain
  - with each trophic level
* encompasses plants, trimmings and other wastes that can be used to make energy.
* is mass.

Biomass fuel
* Some biomass fuels are derived from trees.
* can also include sewage sludge and animal manure
  - significantly displace carbon dioxide emissions from fossil fuels
* come from living things.
* contain no sulphur.
* produce virtually no sulfur emissions, helping to mitigate acid rain.
* supply more than any other fuel sources in Africa.
* use, deforestation, and population in Sudan.

### fuel | biomass:

Algal biomass
* increases rapidly and levels off after about a month.
* is often indicative of the trophic status of a water body.

Burn fossil fuel
* creates gases.
* produces energy
  - heat energy

Burn fuel
* Most burn fuel creates gases.
* Most burn fuel produces energy
  - heat energy

Clean fuel
* Some clean fuel uses electricity.
* can help businesses meet federal pollution mandates.
* have benefits that reach beyond their air quality advantages.
* help decrease air pollution and reduce health-related costs.
* is essential for efficient, full-power engine performance.