By Sarah Lozanova •
April 24, 2008
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With dwindling fossil fuel supplies, coal has been viewed as the energy source of last resort. This outlook is changing as estimated global coal supplies seem to have been severely inflated. Is coal’s future in doubt?
Many experts are saying yes. Professor David Rutledge of CalTech believes that world coal reserves are grossly overstated and could be substantially exhausted this century. This is in stark contrast to earlier forecasts.
Coal Reserves Inflated
In the last 20 years, official coal reserves have fallen by 170 billion tons. To put this number in perspective, global coal consumption in 2007 was 6 billion tons. Reserves figures are dropping far more quickly than actual extraction.
By Sarah Lozanova •
March 27, 2008
One of the most common arguments against large-scale use of renewable energy is that it cannot produce a steady, reliable stream of energy, day and night. Ausra Inc. does not agree. They believe that solar thermal technology can supply over 90% of grid power, while reducing carbon emissions.
“The U.S. could nearly eliminate our dependence on coal, oil and gas for electricity and transportation, drastically slashing global warming pollution without increasing costs for energy,” said David Mills, chief scientific officer and founder of Ausra.
You may be wondering, how will we have electricity at night or during cloudy weather?
Will we use large banks of batteries or burn candles?
The ability to utilize solar thermal technology after the sun sets is made possible by a storage system that is up to 93% efficient, according to Ausra’s executive vice president John O’Donnell.
Not everyone has the same definition for the term ‘renewable-fuel’.
The United States Air Force is well on their way to becoming coal-powered. On Monday, the USAF carried out a transcontinental test flight using a 50-50 blend of standard jet fuel and coal-based ’synfuel’.
“The Air Force is taking a leadership role in testing and certifying the use of synthetic fuel in aircraft,” Secretary Wynne said. “We’re working very closely with our Army and Navy colleagues to ensure that this fuel is capable of operating in all of our aircraft. This is especially important because JP-8 military jet fuel is commonly used in the battlefield by the Army and Marines tactical vehicles and generators, as well as our respective aircraft.”
While synthetic fuel has the capacity to reduce our dependence on foreign oil, it could also double CO2 emissions produced by military flight. At the time of this writing, synfuel is made via Fischer-Tropsch process from either coal or natural gas to produce a somewhat cleaner burning but extremely greenhouse-gas intensive product.
