Late last March, an Alberta engineer appeared before a House Subcommittee on Energy and Power in Washington, D.C. Dressed in a black suit fitted to his narrow frame and speaking in a soft, careful tone, John Nenniger, CEO of Calgary-based technology firm N-Solv Corp., read closely from a prepared statement, making darting glances now and then towards the front of the room. "As a scientist," he told the subcommittee, which was focused that day on Canada's oil sands, "I view extravagant claims with great skepticism, unless they can be supported with compelling evidence." The lawmakers listening might have felt a little skepticism of their own: Nenniger had just finished making some pretty extravagant claims himself. N-Solv's proprietary technology, the Canadian claimed, could dramatically reduce the energy needed to produce bitumen from oil sands, slashing emissions of greenhouse gasses by 85 per cent. It could do this without using any water. And it could potentially make oil sands production twice as profitable. Nenniger's "compelling evidence" came from years of lab tests which suggest that solvents such as propane or butane can melt and recover underground bitumen deposits much more efficiently than the prevailing method of high-pressure injections of super-hot steam. Still, Nenniger's claims will remain unproven at least until April 2013, when a $60-million field test near Fort McMurray is scheduled to produce its first oil. Meanwhile there's a deeper tension straining Nenniger's project -- and any other attempt to "green" the oil sands. That is this: even if the entire industry became fully carbon neutral, so that its recovery of petroleum from buried bitumen released not a single additional molecule of carbon to the atmosphere, its products --gasoline, diesel, jet fuel -- would continue to do so the moment they were burned. So: is it worth cleaning up a sector that strengthens our dependence on the very same fossil fuels that created our global warming crisis? Nenniger thinks it is. The "most pragmatic" way to address the "profound moral dilemma" of climate change, he told his Washington audience, is "finding profitable ways to produce cleaner oil." That appears to be the thinking of the Alberta government as well. During her recent election campaign Premier Alison Redford pledged $3 billion over the next 20 years to help stimulate oil sands innovation. But others I heard from contested such a "harm reduction" approach as nonsensical, a waste of precious time and resources. The debate gets little media attention, but its implications are felt widely, from affecting Canada's prospects for making real reductions in our climate footprint, to offering insight into what environmentalists hope to achieve from picking the battles they do. A 'revolution' over decades Within the oil sands industry, technologies like the one Nenniger promises are known as "revolutionary": long-term bets on new ideas that could, one day, completely change the way bitumen is produced. Given the intense international scrutiny of oil sands emissions, and the potential to vastly increase profits, you might think bitumen producers would be lining up outside Nenniger's Calgary office. But revolutionary innovation by its nature disrupts existing technology. In the oil sands, that could mean risking multi-billion-dollar investments in projects expected to operate with their original design technology for three decades or longer. "You just can't jump from the lab bench" to operating scale, Syncrude executive Eric Newell once told The Globe and Mail. "We've been burned too many times… You have to have a very disciplined approach to how you bring new technology on." That's not to say revolutionary transitions can't happen. They can and do. Most commonly cited is the ongoing shift from traditional oil sands strip-mining operations to "in situ" operations. But even the switch from giant holes in the ground to melting buried bitumen with injections of high pressure steam took more than 20 years from its first field pilot test (the stage Nenniger hopes to reach next year) to wide-scale adoption. Easier to embrace, said Jackie Forrest, global oil senior director for the U.S.-based energy consultancy IHS-CERA, are "evolutionary" innovations; stuff that can be "bolted onto existing infrastructure." Tweaking the footprint A good example is Cenovus, which has some of the most efficient operations in the entire industry, and made the striking announcement last October that its oil was "green" enough to meet California's contentious low-carbon fuel standard. The company is now running experiments that tweak existing in-situ technology. At its Christina Lake operation, Cenovus adds small volumes of butane to the steam injection process, reducing the amount of energy -- and therefore emissions -- needed to produce a barrel of oil. By 2016, when the company's 130,000 barrel-per-day Narrows Lake operation is up and running, if all goes to plan, that innovation will improve its overall energy efficiency by about 15 per cent. The Canadian Association of Petroleum Producers (CAPP), which declined to be interviewed for this series, celebrates such technological triumphs. It often brags that its members cut the amount of greenhouse gas released in producing a barrel of bitumen (the product's carbon "intensity") by 29 per cent between 1990 and 2009. It more rarely points out that overall oil sands emissions grew by 148 per cent during the same period, due to massive increases in production. There are other reasons as well to be suspect of CAPP's narrative of seamless and endless incremental improvement. The Calgary-based industry group announced last December that a decade's worth of emissions progress in the oil sands had actually reversed. Oil sands greenhouse gas intensity grew two per cent between 2009 and 2010. Overall emissions went up as well, by 14 per cent. This is mostly a function, CAPP explained, of the industry's ongoing embrace of in-situ technology. As is often the case with human ingenuity, today's solution becomes tomorrow's problem. In-situ bitumen recovery has nowhere near mining's impact on ravaged boreal forests. But heating all that water into steam requires vast amounts of natural gas, releasing far more greenhouse emissions. Last year, Alberta's in situ operations alone emitted an estimated 19 megatons of CO2, equivalent to the annual climate impact of 3.7 million cars. That number will almost certainly rise: an estimated 80 per cent of remaining bitumen reserves are accessible only by the higher-emission process. Hitting an efficiency limit What's more, industry leaders such as Cenovus admit there's only so much they can do to improve technology's performance. Technical innovation can improve an operator's energy efficiency, or "steam-to-oil ratio" by about 20 to 40 per cent for any given bitumen deposit, Jon Mitchell, Cenovus team lead for environment policy and strategy, told Tyee Solutions. But, he added, "The reservoir is a primary driver." That is, the quality of bitumen reserves being tapped largely determines how much energy it takes to extract. And that could mean an uphill fight for oil sands producers in coming decades just to maintain the greenhouse gas progress they've achieved so far. Why? Because, "first generation oil sands projects selected the very best parts of the oil sands deposit," as a 2010 report from IHS-CERA, the respected energy consultancy, explained. "A general future trend toward lower-quality reservoirs is expected."