OT cutting greenhouse gas emissions to zero by 2050

Does anyone thing that we can cut greenhouse gas emissions to almost zero by 2050? What would have to be done to achieve this? Nuclear fusion might help, but so far no one has got it to work properly.
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Michael Chare

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Michael Chare wrote:

Nope.

This shows how much we've already cut since 1990, and how much we'd have to cut to reach net zero
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We'd all have to stop breathing, too. So would all animals, birds, and insects.
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wrote:

Nope,. just plant enough plants to consume that.
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wrote:

So where would you put those plants, then? I mean, stooging about this country I don't notice thousands of acres of freshly tilled soil that people are perversely refusing to plant up.
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wrote:

Wherever you like with wood. Even easier with limestone etc.
I mean, stooging about this

Plenty that can be planted with trees. Sure, that would fuck the environment there but we werent discussing the environment, just reducing net gg emissions.
Yes, there would still be a problem with aircraft but obviously we could just stop flying so much and telecommute etc instead.
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
Eh?
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Chris

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wrote:

Where you put the limestone you produce to get some CO2 out of the atmosphere.
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You're not making any sense. Limestone doesn't absorb CO2. To absorb CO2 to make limestone you need lime. Where are you going to get it? Getting it from seawater reduces the ability of the seawater itself to absorb the CO2 already in the atmosphere, so will actually make things worse. I ask again, where are you going to get the lime?
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wrote:

We'll see...

Never said it would. I was talking about PRODUCING limestone.

From the sea.

Not by enough to matter if the UK was actually stupid enough to go that route to avoid adding any more ggs to the atmosphere from the production of nukes and electric vehicles.

Not if only the UK is doing it.

I say again, from the sea.
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On 14/06/2019 18:50, Chris Hogg wrote:

It's quite an interesting question. Farming oysters is a good way to make limestone, but where do the calcium ions come from? Presumably, from the weathering of existing rocks. Feldspars are aluminosilicates and can contain calcium, so there is plenty of it available in continental crust. But ions are only liberated at a certain rate by weathering. Does the existing marine fauna already effectively fix all the available calcium ions, or might there be scope to "fix" more carbon dioxide? Apparently the calcium level in seawater is about 400 ppm.
Just did some back of envelope sums and it looks as though that's enough to "fix" 6e17 kg of carbon dioxide, or 300 times the total amount of carbon dioxide in the atmosphere.
Oysters it is, then.
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On Fri, 14 Jun 2019 21:00:05 +0100, newshound

Seawater is naturally slightly alkaline. It contains squillions of tons of calcium, derived as you said from calcium-bearing rocks. It has immense buffering capacity. The various equilibria between calcium ions in solution and CO2 in the atmosphere above it are several and complex. This article touches on the problem and suggests that the oceans are capable of absorbing massive amounts more of CO2 than they already have, and that ocean acidification is in reality unlikely to happen any time soon, unlike what we keep hearing from the alarmists. https://tinyurl.com/yy5vtt55 More here https://tinyurl.com/ycrblwue and your oysters are safe https://tinyurl.com/yxesz6pe
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On 14/06/2019 21:29, Chris Hogg wrote:

Thanks for the fascinating links. I'm afraid I have lazily given up reading that web site, there's just too much to read and digest. First article, 6 pages plus 27 pages of comments!
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wrote:

You want to plant limestone?

All those fields which at the moment produce crops, you mean, f'rinstance?

Of course if you insist on planting up the airports.
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wrote:

Nope, produce that to get more CO2 out of the atmosphere.

Nope, the area which arent used for agriculture.

Pointless, there isnt enough land in those to matter.
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Eh, again?! What are you going to use for the feed material to produce that limestone, and where are you going to get it?
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On 14/06/2019 09:51, Chris Hogg wrote:

Calcium and CO2.
and where are you going to get it?
Well the CO2 is all around and the seas are full of calcium salts.
Expensive way to solve a non-existent problem, mind...
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On Fri, 14 Jun 2019 10:27:13 +0100, The Natural Philosopher

So, you precipitate the calcium as lime, by raising the pH using caustic soda obtained by electrolysis of sea water, using electricity from nukes? That's a hell of a complicated route, unless you can short-circuit it and get the lime by direct electrolysis. Whatever, it ain't going to be anywhere sufficient to lower atmospheric CO2 levels by more than a gnat's whisker.
I see that there are many proposals for lowering atmospheric CO2 by _adding_ lime to seawater (ignoring the environmental side effects, that is!), not by taking it out. https://tinyurl.com/y4yhxcpe , which rather kills the idea of getting lime by that route.
So Jimbo, where's the feed for your limestone production coming from?
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On 14/06/2019 16:20, Chris Hogg wrote:

As long as they don't add it to the sea or the environmental disaster will kill billions when the extinction of sea life starts happening. Maybe that's what they want?
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We aren't discussing lowering atmospheric CO2 levels, we are discussing avoiding adding the minimal CO2 that is involved with the production of nukes and electric cars so the UK stops adding ggs to the atmosphere.

From seawater, as he said. Yes, that is a completely stupid thing to do, but we are discussing whether the completely stupid approach of no longer adding ggs to the atmosphere is possible, not whether it makes sense to do that.
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