Hunter gather man gathered wild rice, wheat, apples, cucumbers. It is not long before he sees a lot of growth around his champsite, and he knows all the plants. He will learn to sow seed.
Consider the environmental impact, especially when the glaciers were retreating. On net, sowing seed as an industry of millions would have retarded the rise in co2. This would be the second great advance, after throwing the rock. The ground is fertile, wet, and barren of plant life, and little animal life. Each season the proto farmer advances a bit north, staying just ahead of any other life, then sows wheat, rice, corn seeds through out. Mass filters, sucking co2 from the south, the ice melt stalls, we have sudden cooling at the tipping point.
The mantel of the north slows, ice is not melting. Time enough for molten magma to stall, and cool. The volcanic release is delayed, we are stuck until we get some volcanic spew. With luck maybe all that magma had enough time to cool and stop its flow?
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