By Erica Rowell •
May 8, 2008
Today’s post is by Dr. Bill Chameides, dean of the Nicholas School of the Environment and lead author of the forthcoming blog The Green Grok. This is the second post in a 2-part series on biofuels.
Last week’s topic was why corn ethanol is an environmental loser.
But are all biofuels losers? No. Some can be winners. One of those is called cellulosic ethanol.
What Is Cellulosic Ethanol?
All ethanol — whether it is corn or cellulosic — is the same chemical compound: C2H5OH. You might recall from elementary chemistry courses that the “OH” group at the end of the formula indicates that the compound is an “alcohol.” Alcohols can have varying numbers of carbon atoms. Alcohol with two carbon atoms is called “ethanol.” The other alcohols are generally too toxic to be ingested, and thus ethanol has been the libation of choice down through the ages. (Ethanol used as fuel is rendered nonpotable.)
So corn ethanol and cellulosic ethanol don’t signify different types of ethanol, but rather the different material (or feedstocks) used to produce them.
By Erica Rowell •
April 30, 2008
Written by Dr. Bill Chameides, dean of the Nicholas School of the Environment and lead author of the forthcoming blog The Green Grok.
This post is Part 1 of a 2-part series on biofuels. Today’s post looks at corn; Part 2 will examine the most promising biofuels.
Who doesn’t want to be green? But beware of automobile ads claiming environmental benefits from home-grown ethanol. Almost all U.S. ethanol comes from corn and, as a fuel, corn just isn’t as “amaizing” as they say.
“What if we could live green by going yellow?” one TV spot asks. “What if we could lower greenhouse gas emissions,” it continues, promisingly, “with a fuel that grew back every year?” Sounds great doesn’t it? Sorry folks, it’s just not so.
By Erica Rowell •
April 16, 2008
This post is by Dr. Bill Chameides, Dean of the Nicholas School of the Environment and lead author of the forthcoming blog The Green Grok.
Everyone knows we need green energy to fight global warming. But there’s another big reason to tap renewable power sources –- not enough water.
Large swaths of the Southwest and Southeast are in the throes of debilitating droughts. North Texas and Oklahoma’s recent dry spell dragged on from 2003 to the spring of 2007 (more on U.S. droughts). Droughts have even wiped out entire civilizations like the Anasazi (see Jared Diamond’s Collapse and Eugene Linden‘s Winds of Change).
But today’s water problems are far more profound than those of the Anasazi. The huge quantities we use — unprecedented in human history — make us more vulnerable to drought. Our water woes stem from an ever-increasing demand for water to slake the thirsts of a growing population on the one hand and to irrigate crops to feed that same population on the other.
Few people appreciate that yet another sector is clamoring for more water — the power industry. Fortunately we have the technology to wean this one from our dwindling supplies.
