I recently became involved in a discussion on another blog about the negative effects of the use of oil as an energy source. A reader left this comment:
In my eyes oil is a cancer that has only grown larger and larger over the years. If we do not do something soon to treat the cancer, then it will devour us completely.
I suggested that our need for oil is more like an addiction to drugs, alcohol or tobacco than a cancer. Not many people feel that they need or want a cancer. It is common for people to consume narcotics until it kills them. And it is reasonable to assume that we might eventually work ourselves into a serious dilemma from our addiction to oil.
But after further thought I considered the possibility that the reader was thinking in terms of the much discussed undesirable environmental effects from the use of oil. That we humans and our machines are simply the host for the oil-cancer much like our body cells serve as hosts for cancer, and that the aim of the oil-cancer is to destroy the environment and us with it.
The problem here though is that it doesn’t matter as much what the source of energy is, but how much of it we use — or more accurately, the amount of motion or activity in the world. That is, the only real way to reduce the net impact of energy use on the environment is to slow the world down. I’m not advocating that we do that; I’m just saying that it may be the only way to reduce the negative effects of activity.
In physics there is a law called the conservation of energy. It states that energy may neither be created nor destroyed. And that the sum of all the energies in a system is a constant. What this means is that the “consumption” of energy just converts the energy into a different form; it doesn’t use up the energy. But, in a real-world system a lot of the “consumed” energy is wasted in the form of friction, heat and emissions. That is, it is not captured but it is still out there.
I’m not a physicist but I think this law can be applied to the debate about clean versus dirty energy sources. I suspect that the net impact on the environment is about the same for a given unit of work done no matter the source of the energy.
Take nuclear powered versus coal powered electricity generation. Energy is consumed and the environment is affected in mining coal and transporting it to the power plant. Energy is consumed and the environment is affected in mining, shipping and enriching uranium. Emissions from coal-fired power plants affect the environment. Handling and storage of radioactive waste from nuclear-powered plants affects the environment. I suspect that the net effects are about the same.
Take wood versus oil as a direct heat source. The production of wood hugely benefits the environment, but the harvesting and transportation of the wood produces negative effects. The production and transportation of heating oil produces negative effects. Both produce undesirable emissions when they are consumed. I suspect that the net effects are about the same.
Take solar panels as a source of electricity. The impact on the environment appears to be about zero, until you account for the manufacture and transportation of the panels. Think about the magnitude of an operation to keep all the homes and businesses in the world supplied with enough solar panels to supply their total power needs. And what about the batteries and their disposal issues?
I think we had better just accept oil as one of our major sources of energy for at least the next couple of decades while we figure out a way to harness all the friction, heat and emissions from current and future sources of energy. But then we’ll probably learn that the harnessing has its own costs and negative effects.
Update: New wood powered electricity generating plants are being proposed in Massachusetts and elsewhere. Wood is the leading renewable energy source in the US.