英语博客：Ethanol anybody?（在线收听）

 　　Today's podcast is going to test your knowledge of ethanol. What is it? How is it made? And what are the advantages and disadvantages of using it? I asked myself these questions recently, when I drove past a gas station that had a sign saying 'No ethanol in our gas'. I asked myself why it would be good to not have ethanol in petrol? I remember hearing about large amounts of the stuff being produced in this country, and how some people are for it, and others are against it. So, what exactly is ethanol, and what are the issues surrounding it(1)? Ethanol is a fuel that, for a long time has been produced from corn. In the U.S., the government subsidized (2)corn growers for many years specifically for the production of ethanol. But,  why would they do this? First of all, a desire to be self sufficient was at the heart of this project. If you can produce your own energy, then there is no longer any need to rely(3) on other countries. Secondly, some believe that the cost would be less than petrol. Thirdly, ethanol reduces greenhouse gases(4) by 18%-29%. Ethanol is easily mixed with petrol, so all cars can use gas (petrol) that is 10% ethanol. There are some cars that can use 85% ethanol with 15% gas. Continuing research has raised questions(5) about ethanol. If we are using millions of acres of agricultural land to produce corn that nobody eats, surely this will raise food prices globally. Also, farming corn is costly, and uses a lot of gas and gas products when you think of the heavy machinery, the transportation, and the petrol-based chemicals used on the plants. How much cleaner is this biofuel than traditional gas? And, should the government be spending tax payers' money on subsidies for a process that isn't overwhelmingly (6) beneficial? Well, as I continued to research ethanol, I found that globally, research has improved its production, and removed the two major problems: using food for fuel, and only reducing greenhouse gas emissions by a small percentage. Apparently, a new ethanol, called cellulosic ethanol is now produced from nonfood crops, such as bark, corn stalks and leaves, and switchgrass. These are agricultural and industrial leftovers, and switchgrass is a rapidly growing weed that is used to prevent erosion. So, instead of expensively growing corn, we can use by-products. Just think of the savings. The carbon footprint(7) is tiny compared to that of growing, transporting, and processing corn. And, talking about our carbon footprint, cellulosic ethanol reduces greenhouse emissions by 85%. Now, that is substantial. Don't you think that collaborative(8) research is always our best route to good ideas? Globally, this is already believed, because research into improving ethanol and making its production efficient and highly beneficial is continuing. Facilites for production are all over the globe, the biggest one being in Italy. People want a home-based, clean alternative to fossil fuels; it will improve global health and national economies. So, on our list of cleaner energy sources, we can add cellulosic ethanol.