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Apr. 8th, 2008 | 11:17 am

Yes, really, 350 ppm

According to Jim Hansen, a noted climate scientist, we need to stabilize carbon dioxide levels at no more than 350 parts per million. His data also says we cannot pass at most 450 ppm, without irreversible damage to our climate. We are currently at 385 ppm. Below are the measurements from Mauna Loa.

The implication is that the line representing current carbon dioxide concentration needs start going down right now.

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Comments {4}



from: rubicantoto
date: Apr. 8th, 2008 11:35 pm (UTC)

Due to temporary dylsexia* I thought, "huh, these findings are a little unexpected coming from the creator of the muppets (both because of his not being alive, and also not being noted for climatology)".

*typo intentional and relevant

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Diane Trout

Re: Off-topic

from: alienghic
date: Apr. 9th, 2008 12:38 am (UTC)

Yes, I had to use cut-n-paste on his name so I avoided typing it Jim Henson.

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How would it not be reverisable

from: dilinger
date: Apr. 19th, 2008 04:54 am (UTC)

If all the humans were removed wouldn't that reverse the climit eventually?

Or maybe just talking about oru life time.

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Diane Trout

Re: How would it not be reverisable

from: alienghic
date: Apr. 20th, 2008 06:21 am (UTC)

Actually it's not clear if humans were removed the climate would reverse. We've already put a large amount of energy into the system, but because the system we're perturbing is so big theres a quite a bit of inertia.

For instance there's these peat bogs in siberia that have been frozen for 11,000 years. They represent a very large carbon sink, that if we achieve a certain level of warming will defrost and dump even more CO2 into the environment which might warm the planet enough that there's virtual no snow. Which would warm the planet further.

We've pushed hard on the climate for 200 years there's no real guarantee that it'll spring back to something familiar to us for tens of thousands to millions of years.

rapid climate change gives some over view of how the climate can make sudden shifts between significantly different stable states.

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