"Civilization as we know it will come to an end sometime in this century unless we can find a way to live without fossil fuels," Goodstein cautions.
That same caution, fueled by the bitter lessons of Afghanistan and Iraq, has kept France's allies on the sidelines, supplying aircraft to transport French troops and refuel French fighter jets, as is the U.S., but staying clear of any front-line roles themselves.
But he cautions that fuel cells can be bulky, which can sometimes be more of an issue than weight on an aircraft.
While the investigators cautioned that fuel consumption depends on many factors, including the weight of the plane's passengers and baggage and the speed and direction of winds along its route, these factors are supposed to be considered when the plane is fueled.
Our anguish, perhaps further fueled by tales of caution, caused us to contract, and now we seek assurance wherever possible.
While this is a tiny fraction of the overall education budget, it will fuel concerns that not enough caution is being exercised on free-schools spending.
The full gamut of IndyCar racing strategy came into play, as some drivers made pit stops for fuel and tyres during the caution periods, others did not and the running order was in a constant change of flux.
Tabaczynski also cautions that real fuel savings will depend on an individual's driving habits.
The unspent solid fuel is toxic, and officials cautioned people who may find debris not to handle it.
Although it cautioned that rising fuel prices or any economic slowdown could quickly dent earnings, Cathay's renewed confidence has prompted it to loosen its purse strings again.
