We only have so much land to plant trees on. (Which is very quickly shrinking due to urban and agricultural pressure.)
The current amount of carbon sequestered in all of the world's forests is ~600 giga-tonnes.
If we stopped all of our carbon emissions today, and tried to roll back to pre-industrial CO2 levels, we'd need to sequester ~270 giga-tonnes of carbon. Losing that much agricultural land is unrealistic - expensive as they are, it would be much less painful to switch our entire energy economy to renewables.
> We only have so much land to plant trees on. (Which is very quickly shrinking due to urban and agricultural pressure.)
The obvious solution being to increase carbon/biomass per hectare in our urban and agricultural land.
>Losing that much agricultural land is unrealistic
Losing it, yes. But replacing it with agroforestry and soil building no-tillage agriculture would increase the food supply (mainly since bare dirt monoculture fields are so abysmal at utilizing sunlight compared to healthy engineered ecosystems). Similar story with replacing corn-fed CAFOs and compacted ranch land with sylvopasture and MIRG (managed intensive rotational grazing).
If it sounds unrealistic to replace our whole food system with something else, remember that there is no alternative. The modern industrial food system isn't a viable replacement for itself. That's all the word "unsustainable" means: it's not an ethical judgement, but a logistic certainty.
Spreading a few million tons of powdered iron ore over the southern ocean will capture vast quantities of carbon in the resulting plankton boom, will feed enormous schools of fish and precipitate to the ocean bottom where it will lay captured for millennia.
You don't need vast forests to capture carbon. You need one soon to be retired 30 year old panamax ship. A cargo hold full of ore (~50$/ton + 20$ powdering), and a on-board pump/aerator.
...and a willingness to accept any unintended or unforeseen consequences.
The burden of proof that "iron fertilization" (or any other geo-engineering technique) will even result in a net reduction in anthropogenic climate change — leaving entirely aside, you know, not actually being harmful — is on the people who want to do it. As much as CO₂, &c, is a problem that begs for something to be done, I don't think that's been adequately demonstrated yet.
What does that mean ? What would be "adequately demonstrated" for rosser would be wildly risky for fooman, and overly risk averse for ageofwant.
ageofwant is satisfied that given the limited trials so far and the Russ George "experiment", which by all indications were wildly successful, large scale ocean seeding trials is called for.
Given the risks associated with doing nothing, and the relative low cost of a large trial, it would be silly, nay morally indefensible not to.
I really want you to be right on this. Way more than I want me to be right.
But the consequences of being wrong on some of the things being suggested to combat climate change could be tremendous, and in some cases even worse than the problem they're being used to solve.
I don't know where the balance that needs to be struck lies, but I'm pretty sure it's somewhere on the far side of:
"Welp, sounds good to me!" — some dude on the internets
This is certainly true, but we are talking about absolutely staggering amounts of land. As it stands now, ~30% of our planet's landmasses are covered in forest. Also, some kinds of forest are much better at sequestering carbon - specifically, the tropical rainforests that are being cut and burnt in the tropics.
Re-forestation is part of the solution, but it's no panacea.
urban pressure is negligible on a global scale--this is actually freeing up vast areas of land for use as people migrate to denser living.
Agriculture is a harder angle to attack; however, trees are excellent use of space: they store carbon for a period of time, they require low maintenance, they oxygenate the atmosphere, they can be planted cheaply and densely; harvesting them allows use of stored carbon (build with wood! Paper. Etc); they can be planted in areas that are typically not friendly to agriculture (eg mountains, places with extreme cold, etc). For the space we do have, there isn't much reason NOT to plant trees.
I would be interested in a comparison between different types of dense vegetation; eg trees vs grass vs moss vs algae, etc etc.
The current amount of carbon sequestered in all of the world's forests is ~600 giga-tonnes.
If we stopped all of our carbon emissions today, and tried to roll back to pre-industrial CO2 levels, we'd need to sequester ~270 giga-tonnes of carbon. Losing that much agricultural land is unrealistic - expensive as they are, it would be much less painful to switch our entire energy economy to renewables.