@HolKann:
Err, do you guys get how biofuels work? The only pollution coming out of them is by producing them, not using them. If it would cost us nothing to produce, it would be the ultimate recoverable energy source (except for the “less room for food”-part). CO2 isn’t produced by burning biofuels. As it isn’t “produced” by burning fossile fuels. This seems counter-intuitive, but let me explain it:
-warning long post without summary, but I did my best to keep it readable-
An easy-to-use form of energy is fuels (either fossile or bio). These fuels are carbohydrates, connections of carbon and hydrogen (C and H). These are the connections, when burned with oxygen (O2), that supply us with energy, resulting in carbo-oxydes (dunnow the right English word) (like CO2) and hydro-oxydes (like water: H2O).
How did these fuels develop? Both fossile and bio developed the same way: Plants take CO2 from the air, H2O from the ground and energy from the sun’s light. They combine these elements to form the C and H connections we use. As you can see, the circle is round: CO2 is removed from air by growing plants, CO2 gets back to air by humanity burning plants. (Solar) Energy is captured by plants, energy is used by humanity. And as everyone knows, both fossile and biofuels are made of plants.
So burning both fossile and bio fuels is like putting CO2 back where it belongs: in the air, ready for new plants to grow. Why is burning fossile (bio: see later) fuels bad for our environment then? Because it has to do with the time-scale: all the CO2 in fossile fuels is gathered over millions of years, and didn’t get back in the atmosphere. The atmosphere found a balance of it’s own, not needing the CO2 from all these plants. Now we are burning all these plants (under the form of oil), and putting this incredible amount of CO2 back in the atmosphere, with global warming as a result. Which ofcourse is bad :-(
Why is burning biofuels not bad (in theory)? Because it takes the CO2 we have in our atmosphere TODAY (as opposed to fossile fuels containing CO2 from millions of years ago) to grow these fuels. So all of the CO2 produced by burning biofuels, was removed from our atmosphere whilst growing biofuels. So the net gain of CO2 in our atmosphere by growing and burning biofuels is 0 seen on a timescale of a couple of months! It doesn’t matter how much CO2 biofuels produce when burned, because that’s also the amount they took from the atmosphere whilst being produced some months before. Which clearly is not bad :-)
This is why some years ago governments started supporting biofuels: it is better for the environment when done right. Nowadays, problems have become clear: extra high food prices, burning of rainforests to make way for biofuelcrops, too much energy invested in growing the biofuelcrops, extra chemicals needed to grow the crops etc. Nonetheless, there are ways to make good use of biofuels bypassing most of these problems, so don’t give biofuels the bad name it doesn’t deserve. But as with all things, theory is only the first step towards reality…
@Smacktard:
There’s no doubt that current biofuels are more pollutive, even if the fuel itself is LESS pollutive, because WE have to make the biofuels. In the case of oil, nature’s already done the dirty work for us, over millions of years. All we need to do is get it out of the ground, which is ridiculously easy to do in the Middle East.
I’m sorry, but current biofuels are less pollutive (in terms of CO2) when done right (this is when grown in places with enough sun/water/…, where no forests needed to be burned down, and when the resulting fuels aren’t transported to the other end of the world. Unfortunately, these are also the ideal circumstances to grow food…).
That’s a good point, and, as a rule of thumb, we probably shouldn’t be massively releasing CO2 that’s been stored in the earth over millions of years, but…
Do you live near an agricultural area? I live about 45 miles from Bakersfield, CA. I can tell you that farming is very energy intensive, involving all sorts of exhuast spewing machines: Tractors, migrant farm workers riding around on ATV’s, planes (not all the time, but there still is crop dusting going on), harvesters, and whatever machines they use to turn corn into a refinable product. Not to mention all the chemicals that go into modern-day farming (Bakersfield has a rather peculiar smell, when the wind blows right). Even though the end product has a net CO2 value of zero, developing it is another story.
"THE RESULTS Both studies found that changes in land use related to biofuel production would be a significant source of greenhouse gases in the future. Fargione reported that, overall, biofuels would cause higher total emissions for tens to hundreds of years. Some ecosystems had surprisingly high emissions—grasslands in the United States converted to corn farms would increase carbon dioxide for 93 years.
Searchinger’s outlook is bleaker: He estimates that the rise in corn-based ethanol production in the United States would increase greenhouse gases, relative to what our current, fossil-fuel-based economy produces, for 167 years.
THE MEANING “Any biofuel that causes clearing of natural ecosystems is likely to increase global warming,” Fargione says. But not all biofuels are alike. For one, sugarcane ethanol, produced in Brazil, stands out to both researchers as the most efficient source studied, in terms of emissions. As long as there is land conversion, though, biofuels do not diminish carbon dioxide emissions. Biofuels made from sources that do not require land conversion, such as corn stover (the parts of corn plants left over after the ears are harvested), animal waste, damaged trees, algae, and food waste are promising alternatives.
STATS BEHIND THE STUDY
• Plants and soils contain almost three times as much carbon as the atmosphere.
• About 20 percent of total current carbon emissions comes from land-use change.
• In 2004, 74 million acres of U.S. land were devoted to corn for livestock feed as well as food crops. By 2016 about 43 percent of that area will be used to harvest corn for ethanol.
• 27 percent of new palm oil plantations in Indonesia are created on land that began as tropical rain forest; 1.5 percent of these lands are being deforested each year.
• In 2006 the United States produced 250 million gallons of biodiesel. Total production capacity is already 1.4 billion gallons a year and is expected to more than double with new plants and expansion of existing ones.
• 2006 ethanol capacity was 4.4 billion gallons, with an expected increase of 2.1 billion gallons with current construction and expansion projects.
• U.S. gasoline consumption is 389 million gallons per day, or about 142 billion gallons per year."
http://discovermagazine.com/2008/may/03-biofuel-farming-looks-to-be-an-environmental-disaster
And that study didn’t even go into the pollution of biofuel production- it was strictly based on land change-over.
http://www.ewg.org/factsheets/cornethanol
Just some info on how damaging to the environment corn is.