That rule, said Daniel Sperling, an air board member and a UC Davis transportation fuel expert, spurred "a massive expansion of corn ethanol". The corn from which ethanol is derived requires large amounts of water and petroleum-based fertilizer to produce and, according to some studies, diverts land from pastures and rain forests, which store carbon.
But what about the experts who spurred him on?
On Thursday, Specialist Hutchinson received an other-than-honorable discharge, ending an impasse that had surprised many legal experts and spurred lively debate in military circles.
More than twenty years of holiday, tree recycling have taught south Louisiana residents about the coast's shrinkage and, experts say, spurred a recent effort to plant cypress-tree seedlings near waterways to protect soil.
New economic challenges, the experts said, have spurred even more demand for such arrangements.
The experts would be spurred on by the desire to be first with an attribution but held back by the fear of looking foolish.
Improved food and drink and Wi-Fi, coupled to expert revenue management, spurred a "significant increase in the number of First Class journeys".
What may have been considered eccentric then can only be called essential now: new ways of digitizing and sharing scientific data are sprouting up everywhere, and Summers' prescient work has spurred other experts to attempt the same.
Demand came from both individual and institutional investors, experts said, and was spurred by both solid investment performance and the lack of any headline-generating hedge fund meltdowns.
"The discoveries have spurred energy experts and policy makers to start looking to natural gas in their pursuit of a wide range of goals: easing the impact of energy-price spikes, reducing dependence on foreign oil, lowering 'greenhouse gas' emissions and speeding the transition to renewable fuels".
