Top: Science: Energy: Bioenergy: Terminology: E



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Effluent

The liquid or gas discharged from a process or chemical reactor, usually containing residues from that process.


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Emissions

Waste substances released into the air or water. See also Effluent.


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Energy crops

Crops grown specifically for their fuel value. These include food crops such as corn and sugarcane, and nonfood crops such as poplar trees and switchgrass. Currently, two energy crops are under development: short-rotation woody crops, which are fast-growing hardwood trees harvested in 5 to 8 years, and herbaceous energy crops, such as perennial grasses, which are harvested annually after taking 2 to 3 years to reach full productivity.


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Externality

A cost or benefit not accounted for in the price of goods or services. Often "externality" refers to the cost of pollution and other environmental impacts. 



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