>I've wondered whether we should start putting carbon back into the ground, and whether this is feasible
Calcium Carbonate is an alternative to plastic and plants. It has worked in the past. Disclaimer, I am a classically trained rock licking geologist. The CaCO3 will be in the form of the lifeless bodies of dead things accumulating in sea bottom ooze, not that different from 'the ground' although once it becomes carbonate there is no going back. Some places will be too deep, some marginally to acid but there are large parts of the world that could support accumulation. Someone with a calculator can work out the volume of 30 gigatonnes of CO2 converted to CaCO3.
>Unicorns don't exist in the real world...
Yes they do, they are also known as rhinoceros, are ugly as homemade sin, and mean.
Eatted, not et.
And both are correct.
The simplest answer is that American tech workers have a better union.
"An idealist is one who, on noticing that a rose smells better than a cabbage, concludes that it will also make better soup." - H.L. Mencken