I don't think he is aware that raking up dead leaves and dry bushes in 33 million acres of forest would be even more labour-intensive than building an insurmountable wall across a continent. Raking them up in California, I mean. In Finland where 80% of the land (50.16 million acres) is covered in trees it wouldn't even enter anyone's head to consider it.
What there should be (and I hope there are) are fire-breaks where a strip of trees has been felled and cleared at intervals to stop the progress of the flames. Even then a spark can be blown across in the wind and carry the fire on.
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