I have heard a lot about how good biodiesel is for the environment, and that it actually cleans the air. I think that it’s a really great alternative to fossil fuel, and I want to start using it with my car (a new Subaru Forrester)
However, I’ve heard that biodiesel can be really bad for your engine if you don’t have a relatively new diesel car. Then just the other day I read in an article that it works fine with any newer cars. Please tell me if my car (again, a subaru forrester) can handle it!!

What is your opinion on biodiesel and what to you think americans would do if the world ran out of fossil fuel?

Please thoughts would be helpful. I am taking a survey for my job. thanks in advance to everyone! =)

There are two key problems.

Firstly the change in use of arable land to biodiesel agriculture is creating an unholy competition between food for people, and "food" for cars, which has resulted in huge hikes in the price of food crops such as wheat, causing increasing starvation and poverty globally.

Secondly even if ALL global land use were turned over to biodiesel production, it would still be nowhere near enough. Presently 20% of US argricultural land is only producing enough biofuel for 2% of vehicles.

(source and reference http://www.monbiot.com/archives/2005/12/06/worse-than-fossil-fuel/)

So when will people wake up to this?
Checked out wiki on algae as suggested, turned up this "However, according to one 2007 study, algae-based biofuel will not be commercially viable until fuel prices exceed 0/barrel" – which of course doesn’t mean you are wrong. It just means that fuel will be ten times the present price IF a viable strain can be produced.
While scrap oil conversion into biofuel is just great, it would provide less than 0.3% of the fuel needed if all of it was used for fuel.
Just a thought Derek on this Algae stuff. Whatever claim is made algae-producing oil, the laws of physics are inviolate. Algae like any other plant fixes energy through photosynthesis which is essentially powered by the sun, and therefore subject to the 1kw/m^2 rule x process efficiency. The 4000-10000x as good as other biofuel looks on surface inspection to be little more than hype, comparing the top google search (which smacks of MLM) with the more balanced wiki entry.
@ Molly – same deal as chipfat. There are some good sources which can be converted from waste, but the volume of waste is nowhere near enough to solve the problem on its own. When have to start turning over land-use you hit exactly the same trouble.

"Battelle’s recent report entitled, "Near Term U.S. Biomass Potential", looked at a scenario for producing 50 billion gallons of ethanol per year from cellulosic biomass. "The primary biomass supply would consist of waste biomass streams plus the production of energy crops." The waste stream was estimated to contribute 40-50% of the supply. The report concluded that the expansion of biomass supplies needed to achieve this level of production "would not result in large impacts on the agricultural system." Beyond this level of production, "dedicated energy crops would be required with implications for the cost of cropland and competition with food crops."

http://www.harvestcleanenergy.org/enews/enews_0505/enews_0505_Cellulosic_Ethanol.htm

Bohemian, what you post is actually a consequence of the competition between land to be used for food or oil. In the first instance land upon which food production was not profitable becomes profitable for the first time. That is how it begins, but not where it ends.

Biofuel is an alternative energy that can be produced from renewable resources and are meant to be a climate friendly substitute for fossil fuels. There are various types of biofuels but the most common that are being mass-produced are made from corn, sugarcane, soybean, and palm oil. At the moment, yellow corn is one of the largest sources of biofuel in North America. It is converted into ethanol and emits approx. less greenhouse gases than gasoline when used as fuel. Butanol (called “biobutanol” if derived from biomass) is an alcohol similar to ethanol but with a higher energy density. Despite this and other advantages butanol is currently more expensive to produce than ethanol.

However the environmental costs associated with biofuel’s production weigh much higher. In the October 2007 issue of National Geographic, Joel K. Bourne writes in the article Green Dreams that the process of making ethanol from corn is a losers game, requiring more carbon-emitting fossil fuel than it displaces. He states this because the process involves industrial farming methods such as the use of diesel machinery to drive the distillation process from corn to ethanol, and the fertilizer that is required to grow the corn emits nitrous oxide that is 300 times more insulating than the most common carbon dioxide.

A series of guidelines, plans, and strategies were undertaken to invigorate the production of biomass energy since 2005. To ensure the steady development of the domestic biodiesel industry, China is likely to continue having a stern regulatory control on the biodiesel industry from 2007 to 2010, while the more advanced bioethanol segment already has regulations governing it,” says the analyst. This stringent national control over the bioethanol industry has dissuaded foreign investment.” However, investors could gain favourable policy outcomes and government support by liaising extensively with government branches. They also need to conform to the Chinese regulatory environment and establish alliances with local manufacturers instead of setting up wholly funded branches.

Oils
Biodiesel can be produced from many types of vegetable oils. The ones most commonly used are soybean and rapeseed oils. In the United States, 90% of biodiesel is produced from soybean oil. It can also be produced from crops such as Jatropha, field penny cress, sunflower, palm oil, mustard, etc. Other sources for biodiesel include Waste Vegetable Oil, animal fats like lard, yellow grease and tallow. Biodiesel can also be made from the byproducts derived in the process of making Omega-3 fatty acids from fish oil.

Another important economical source for production of biodiesel is algae. Algae for producing oil for biodiesel can be sourced cheaply from sewage wastes thus obviating the need for land which can be utilized for growing food. Many people consider waste vegetable oil to be the most ideal source for production of biodiesel. But the volume of biodiesel required to be produced to meet the demands of the transportation and household sectors is too large to be met with the inadequate supply of waste vegetable oil. Similarly inadequate is the supply of animal fat to produce biodiesel. Use of petroleum diesel can however be reduced to some extent by using discarded animal fat to produce biodiesel. Discarded chicken fat that can be procured from local poultry firms can be a viable source for biodiesel. Around 3 million gallons of biodiesel can be manufactured from nearly one billion kg of chicken fat and this source is utilized by some plants in USA

Not Enough to Replace Fossil Fuel
To produce soybean and animal fat in a scale than can produce enough biodiesel to substitute petroleum diesel as fuel is practically not possible. The enormous quantity of vegetable oils required to be produced towards making biodiesel would need very large scale farming with use of pesticides and fertilizers. People all over the world might object to such large scale diversion of agricultural land for producing vegetable oilseeds instead of food cultivation. As per the estimates of the Energy Information Administration of the US Department of Energy, consumption of diesel as engine and heating fuel is around 160 million tonnes in USA. Production of vegetable oils and animal fat in the country is estimated to be around 11 million tonnes and 5.3 million tonnes respectively that indicate the inadequacy of the production of these substances to produce biodiesel in sufficient volume to replace petroleum diesel.

From Algae
To produce biodiesel from soybean oil to meet the estimated consumption in USA of 160 million tonnes of fuel would require the total cultivable land of the country. This impractical prospect can be eliminated by the alternative option of using algae from sewage wastes that is economical and does not require much land. According to the estimate of the Department of Energy, to meet this fuel need, only 15000 square miles of land is required for growing algae. Algae can be grown in arid lands including in desert and marine conditions and can yield more oil for biodiesel than other plants. The energy yielded by algae per acre is estimated to be 30 times more than crops grown on land like soybean.

More articles:
Biodiesel From Algae – History Of Biodiesel