Biomass energy was the pre-historic source of energy and building materials. Its depletion led to the fall of civilizations, as John Perlin has shown in his book Forest Journey.
Today, for people in developed countries, bio-energy means corn ethanol and soybean bio-diesel, along with second-generation cellulosic biofuels systems for internal combustion engines.
But a majority of the world’s people cannot afford a car; they depend on wood for cooking fuel and candles for lighting. According to energy analysists, they live at the bottom rung of the “energy ladder.” And, as they become more developed, on an individual and national scale, they move “up” to LP gas and kerosene. According to the 2005 Encyclopedia of Energy:
Traditional fuels, such as firewood and dung, are relatively inconvenient to collect and store, require constant management while in use, and emit large quantities of smoke that has a detrimental impact on the health of the users. Modern fuels, such as natural gas and electricity are more convenient, cleaner to use, have power outputs that are easily controlled, and can be delivered directly to the kitchen (once the basic transmission and distribution infrastructure is built). The energy ladder or energy transition embodies the idea that as household income rises through the development process, they choose to utilize modern fuels and choose not to utilize the traditional fuels. (Cleveland, 2005)
But the idea of an energy ladder is little more than a celebration of the status quo. We need to be careful of loaded concepts such as “modern fuels” and a hierarchical energy “ladder,” and consider instead what might be a range of wise uses for existing resources in preference to moving up the “ladder” and increasing dependency along with convenience.
So, the world’s biggest energy crisis, for most of its population, is not oil supply but rather the lack of fuel wood. The question is not whether billions of people can move “up” the energy ladder, but rather, how to best employ the most renewable resource of them all – human ingenuity.
To illustrate the alternatives to the “ladder” concept, consider these solutions:
Improved wood stoves:
Bio-gas digestersin the Dairy Industry