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Whether these changes in land use and animal husbandry would have been enough to impact the climate, I don't claim to know, but to blatantly ignore them is a pretty poor effort.
It would come down to scale. Eg man has been doing agriculture, cutting wood and even burning a little bit of coal found near the surface for a very long time. But prior to the industrial revolution all of this, including agriculture, was on a scale that is small compared to today. Hence it could be argued that whilst we had agriculture a very long time ago, it wasn't on a big enough scale to really matter.
The whole debate is essentially about scale as are pretty much all environmental issues. Burning coal, logging forests, damming rivers or whatever - not even the Greens argue that we can't burn any coal, that we should not cut any trees or have any dams. It's the sheer scale of it all that becomes a problem - it's one thing to cut 6,000 tonnes of wood to make furniture, an entirely different problem when you cut 6 million tonnes and export it all as woodchips.