This is a continuation of the previous podcast on energy and entropy. If you want to have net carbon out of the atmosphere and back into the ground how do you do it without using even more energy (and carbon)? Harness waste (and entropy) and put carbon back. Starting with poo. This was actually in a little book called the Bible. Heh, who knew? Well, everyone who saw soil exhaustion ruin every ancient civilization but ones where rivers dumped crap back into the soil after bad farming had dumped it into the river.