I think he's right. We don't know exactly where the baseline is—the measurement—so, if anything, we need to take a step back. Some of the soil health testing methods we're using are almost a century old. Again, are we looking at carbon saturation, or how much soil can be pulled in?
I know the current measurements only look at root depth for crops that go to a certain point, whereas a crop like canola goes deeper. There are some fundamental basics, Mr. MacGregor, that we don't know yet, which makes it very difficult to determine, as we get into more nascent sciences, and possibly to measure indirect emissions, for example.