Question

energy return on investment (eroi) is a method for evaluating the feasibility of developing an energy source. (the amount of energy produced by the source must be larger than the amount of energy used to obtain and use the source.) which one of the following is typical for the eroi for a source? select one: a. ethanol from corn or sugar cane has a high eroi. b. most renewable sources have a higher eroi than fossil fuel sources. c. new fossil fuel sources generally have a lower eroi than older ones. d. hydroelectricity has a low eroi.

Explanation:

Ethanol from corn or sugar - cane has a relatively low EROI due to high energy inputs in production. Most renewable sources do not necessarily have higher EROI than fossil - fuel sources. Hydroelectricity typically has a high EROI. New fossil fuel sources, such as those from more difficult - to - access reserves (e.g., deep - sea oil, tar sands), generally require more energy to extract and process compared to older, more easily accessible sources, so they have a lower EROI.

Answer:

C. New fossil fuel sources generally have a lower EROI than older ones.