- 1st – made from sugars, starches, oil, and animal fats.
- 2nd – made from non-food crops or agricultural waste, like switch-grass, willow, or wood chips.
- 3rd – made from algae or other quickly growing biomass sources.
- 4th – made from specially engineered plants or biomass that may have higher energy yields – also a way of capturing and storing CO2 in return.
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