Biomass is one of the oldest and simplest ways of getting heat and energy, and it’s starting to make a comeback due to its status as renewable resource. Some, however, aren’t so sure that using more of it would be good for our environment. So, how sustainable is biomass energy really?
What is Biomass?
Biomass is organic material from plants and animals. It naturally contains energy because plants absorb it from the sun through photosynthesis. When you burn biomass, it releases that energy. It’s also sometimes converted into a liquid or gas form before it is burned.
Biomass includes a wide variety of materials but includes:
- Wood and wood processing waste
- Agricultural crops
- Garbage made up of food, yard and wood waste
- Animal manure and human sewage
About five percent of the United States’ energy comes from biomass. Biomass fuel products such as ethanol make up about 48 percent of that five percent while wood makes up about 41 percent and municipal waste accounts for around 11 percent.
The Benefits of Biomass
Biomass is a renewable resource because the plants that store the energy released when it is burned can be regrown continuously. In theory, if you planted the same amount of vegetation that you burned, it would be carbon neutral because the plants would absorb all of the carbon released. Doing this is, however, much easier said than done.
Another potential is that it serves as a use for waste materials that have are already been created. It adds value to what otherwise would be purely waste.
Additionally, many forms of biomass are also relatively low-tech energy sources, so they may be useful, or even required for older buildings that need an electrical renovation.
Drawbacks of Biomass
A major drawback of using biomass fuel is that it is not an efficient process. In fact, burning it can release even more carbon dioxide than burning the same amount of a fossil fuel.
While you can replenish the organic matter you burn, doing so requires complex crop or forest management and the use of a large amount of land. Also, some biomass, such as wood, takes a long time to grow back. This amounts to a delay in carbon absorption. Additionally, the harvesting of biomass will likely involve some sort of emissions.
Is it Sustainable?
So, is biomass energy sustainable? Measuring the environmental impacts of biomass fuel use has proven to be complex due to the high number of variables, which has led to a lot of disagreement about this question.
Some assert that biomass use cannot be carbon neutral, because even if you burned and planted the same amount of organic matter, harvesting it would still result in some emissions. This could perhaps be avoided if you used renewable energy to harvest it. A continuous supply of biomass would likely require it to be transported long distances, worsening the challenge of going carbon neutral.
With careful planning, responsible land management and environmentally friendly harvesting and distribution, biomass could be close to, if not entirely, carbon neutral and sustainable. Given our reliance on fossil fuels, high energy consumption levels and the limited availability of land and other resources, this would be an immense challenge to undertake and require a complete overhaul of our energy use.
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How to Improve the Biomass Industry
Biomass could emerge as a major solution to our energy and sustainability issues, but it isn’t likely to be a comprehensive solution. There are some things we can do, though, to make biomass use more sustainable when we do use it.
- Source locally: Using biomass that comes from the local area reduces the impact of distributing it.
- Clean distribution: If you do transport biofuel long distances, using an electric or hybrid vehicles powered largely by clean energy would be the most eco-friendly way to do it. This also applies to transporting it short distances.
- Clean harvesting: Using environmentally friendly, non-emitting means of harvesting can greatly reduce the impact of using biomass. This might also involve electric vehicles.
- Manage land sustainably: For biomass to be healthy for the ecosystem, you must manage land used to grow it with responsible farming practices.
- Focus on waste: Waste is likely the most environmentally friendly form of biomass because it uses materials that would otherwise simply decompose and doesn’t require you to grow any new resources for your fuel or energy needs.
Is biomass energy sustainable? It has the potential to be, but doing so would be quite complex and require quite a bit of resources. Any easier way to address the problem is to look at small areas of land and portions of energy use first. First, make that sustainable and then we may be able to expand that model on to a broader scale.