On 13/07/10 23:43, John Nissen wrote:

Dear Ron,

The letter argues that geoengineering is now our only hope - our only option to avoid sea ice disappearance and the possibility of catastrophic methane release - since only geoengineering can act quickly enough to cool the Arctic. Procrastination will reduce chances of success, as well as increase chances of unmanageable side effects.

Cheers,

John

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In science, there is no such thing as "only hope" or "only option" (precisely like Software Development). There are always plenty of options. You are making bold claims to a problem you have not provided an adequate quantitative examination of.

At this juncture, there is a lack of peer-reviewed scientific observations that corroborate your claims. Consequently, stating that a specific solution is our "only hope" to solve a problem that not everyone in this group is convinced exists is not going to be considered favorably.

As has been pointed out by various members of this list, what is required is more data so that a strong scientific report could be produced that provides a *quantitative* measure of our current situation. Once this is understood, I'm sure it would be possible to suggest more solutions. Perturbing a chaotic dynamical system should only be considered as a last resort.

When the Manhattan Project was commissioned, there was a clear and present danger. In your case you are requesting (very) large scale action based on qualitative arguments, predictions and models (many of which are strongly contested).

I would like to emphasize that I am just as concerned as all of you about pollution and climate change. Homo Sapiens must respect nature much, much more.

Regards,
Yousif

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