In 2007, within Alberta, we had what's commonly known as the SGER, basically the overhang of emissions that were resulting in large final emitters, so the specified gas emission reduction protocol.
Under that protocol came the opportunity to devise different types of offsets in the carbon market. Those offsets allowed large final emitters to either pay the tax, which was set in Alberta back in 2007 at $15 a tonne, or use a carbon offset to offset their emission overhang. Over the course of that time, just through the conservation cropping protocol—which refers to direct seeding or no-till farming or zero tillage—we managed to not only sequester but also have third party verification that this indeed was taking place, and to serialize, which means to actually put a serial number on that carbon credit that was generated on the registry in Alberta. It was the equivalent of 14.7 million tonnes, and that would be the equivalent of every single pickup truck that was sold in 2017 within North America.
There's huge potential when that potential is recognized. There have been some hiccups and bumps along the way. When you have changes in government and regulation and policy going forward, it's an unpredictable policy environment. We've had certain changes, of course, that have allowed large final emitters to use only 30% of their emission overhang as offsets, so in essence that somewhat crashed or resulted in big discounts from, say, that $15 a tonne down to much lower.
There's huge potential. We know we can capitalize on it. We know we're already adopting a lot of these mitigation technologies, not only in agriculture but also in forestry and even in waste management with methane capture for some of those landfills that don't have other options.
Don, I know you would like to add to this.