This article is part three of a short series for October’s National Energy Awareness Month by National Geographic Geography Intern Hannah Dempsey. Find part two on biopower here, and part one on tidal energy potential here. Reliable. Constant. Ancient. Geothermal energy is as old as the Earth itself, and we take advantage of this naturally occurring phenomenon to make electricity. Geothermal energy powers three and … Continue reading Truly Alternative Energies: Geothermal Power
What do natural gas, oil, sugar cane, corn, and algae have in common? They can all be used to create energy. Biomass energy can be generated from any organic material, but typically comes from crops (like corn, wheat, cotton, and soybeans), wood, and waste—and is often renewable, unlike natural gas and oil.
Creating energy from biomass
There are three ways energy is gleaned from biomass. Biomass can be: (1) burned for heat; (2) converted to electricity—there are several ways this can be done; and (3) processed into biofuel.
Humans have been burning biomass for heat for thousands of years, but only recently have taken advantage of biomass for power. As of May 2016, there were 227 biopower plants in the U.S., utilizing a range of materials such as municipal solid waste, wood chips, agricultural or food waste, or poultry litter to create electricity. The organic matter is dried (or allowed to decompose, in the case of solid waste or manure) and then burned.
Biofuel—ethanol or biodiesel—refers specifically to liquid created from organic material to power transportation. Frequently this comes from corn, soy, algae, or even a whale carcass, and is mixed with traditional fuel like gasoline.
Biofuel is created by pyrolysis or by gasification—processes that heat the organic material at extremely high temperatures in a low oxygen environment and result in a synthetic gas that we can ultimately use as fuel. (Or we can just add some bacteria that munch on plant sugars and produce ethanol themselves!)
Advantages and disadvantages of biopower
Biopower could be a highly renewable and efficient source of energy. We can use waste that would otherwise rot in landfills, plants that can be grown quickly, and materials that can act as a carbon sink during their lifetime.
However, biomass feedstocks can be depleted faster than we can replenish them, making biopower potentially unrenewable by definition. Crop cultivation is relatively quick, but contributes to the costs of industrial agriculture, namely monoculture, pesticides, and water usage—and is somewhat political as well.
There is also the complicated problem of how using food for fuel could affect food prices and availability, but there is little consensus among the economic experts about the impact biofuels could have.
Additionally, biofuel typically is not used by itself and merely assists fossil fuels to power cars.
Most unfortunately, biopower plants burn the organic material, resulting in carbon emissions and air pollution. Algal production is the most promising form of biopower (it doesn’t require arable land nor fresh water) but given technological constraints it is also the most expensive.
Despite these drawbacks, I am convinced that biopower will be a viable, clean, and prolific energy option in the future. If nothing else, we can decrease our municipal and agricultural waste while also creating energy–and hopefully savvy technology will one day provide us all cars that run on plants.
This article is part one of a short series for October’s National Energy Awareness Month by National Geographic Geography Intern Hannah Dempsey. We live in a time where oil is a highly politicized, billion-dollar industry. Where mountains are destroyed so we can pick at the coal buried underneath. Where climate change threatens our coffee beans. Pick a reason: politics, money, or the environment, we need … Continue reading Truly Alternative Energies: Tidal Power
ENVIRONMENT Across the globe, cities are tackling climate change by shifting away from fossil fuels. Yet a survey shows they’re now at very different stages. (Nat Geo News) See how difficult it is to balance a city’s energy portfolio. You have the power! Teachers, scroll down for a quick list of key resources, including a link to today’s MapMaker Interactive map. Discussion Ideas According to … Continue reading Which Cities Are Fossil-Fuel Free?
POLITICS A surprise U.S.-China climate deal to cut greenhouse gas emissions sets ambitious targets that will likely prove difficult to accomplish, especially given the looming Republican takeover of the U.S. Congress. (National Geographic News) Use our resources to better understand climate change. Teachers, scroll all the way down for a short list of key resources in our “Teachers Toolkit.” Discussion Ideas The surprise climate change … Continue reading 3 Obstacles for Surprise U.S.-China Climate Deal