GreenBiz photocollage One of the world’s largest oil and gas companies is betting that the future of flying is carbon-neutral. That may seem an audacious notion from a company whose business model for well over a century has centered around bringing fossil fuels to market — and is banking on petroleum being a key, albeit declining, fuel for decades to come. And it may seem unlikely that an industry as carbon-intensive as aviation — a hard-to-abate sector, in the argot of the climate policy crowd — somehow might emerge with its green credentials flying high in a climate-constrained world. But we’re collectively traversing uncharted territory during unprecedented times, creating unparalleled opportunities to transform some of our most unsustainable systems.