I am revising my paper, "How to fix global warming with cold fusion." People have made valuable suggestions and corrections. I thank them. That's the beauty of putting a preliminary version on line. It is embarrassing to have people find your mistakes, but revising and getting it right is more important than avoiding embarrassment.
The biggest mistake is that I forgot that wood is only ~50% carbon. Second biggest is I had to revise the number of robots needed. It was too high, for complicated reasons. I may cut up some wood with my Dremel tool to estimate how many liters a day a small robot could cut. I think my estimate of 5 liters per robot per day is too low. Does anyone want to hazard a guess? I based the original estimate on the hours that a tree service is allowed to work in Atlanta (from 7 am to 7 pm.), and how long it takes them to remove a tree. In a forest, the robots might work 24 hours a day, with low illumination. You can cut large branches or cut down trees without worrying where they fall. It is a lot faster than cutting trees in a city.
The biggest change I have made is to include an Appendix with an estimate of how much this project would cost. It is cheaper than I thought. I found good sources describing the present day cost of excavating surface mine coal, and shipping it. This one is excellent:
“In 2020, the national average sales price of coal (excluding anthracite) at coal mines was $28.88 per short ton, and the average delivered price of all coal delivered to the electric power sector was $36.14 per short ton. The difference is an average transportation cost of $7.26 per short ton, or about 20% of the average delivered price to the electric power sector.”
“In some cases, such as in long-distance shipments of Wyoming subbituminous coal to power plants in the eastern United States, transportation costs are more than the price of coal at the mine.”
Lots more good info.
This is pretty good:
Mining Industry Energy Bandwidth Study
I looked up the cost of machines that make charcoal. I found one that processes 4.5 tons per hour, and costs $240,000. It can process wood chips, sawdust, coffee grounds, rice husks, straw, peanut shells . . . you name it. Very interesting.
I assume that the cost of shipping 1 ton of charcoal from Georgia to Wyoming and then burying it will be roughly the same as the cost to dig up 1 ton of coal in Wyoming and ship it to Georgia. That may be pessimistic. Putting stuff in a hole in the ground may be cheaper than digging the hole in the first place.
I assume cold fusion will make energy costs zero, and robots will greatly reduce labor costs.
With one thing and another, to sequester 15 billion tons of carbon per year, I estimate it will cost $397 billion per year, worldwide. That does not account for some ancillary profits, such as cities paying the project to take yard trimmings, coffee grounds and other organic waste, to keep it from cluttering up local landfills. Quoting myself: "To put that in perspective, worldwide soft drink sales are $850 billion. So, for half of what we pay for fizzy drinks, we can reverse global warming and improve the quality of forests."
I will upload a new version in a few days.