Another thing to bear in mind is that by draining wetlands we have
greatly reduced the flow of iron into the oceans. This is because peat
produces complex organic acids (eg, humic acid) which dissolve and
chelate iron - abundant in many rocks - and carry it down to the ocean.
So we have already "experimented" inadvertently by reducing iron inputs
to the ocean. And of course this is the most useful form of iron as it
is in a highly soluble and bio-available form. And we have replaced that
iron with masses of silt, nitrate and phosphate from stupid kinds of
agriculture.
Oliver.
On 26/06/2013 09:38, Joshua Jacobs wrote:
Because of the torrential summer rains, potentially driven by regional
climate instability, the largest dead zone ever is predicted in the
Mississippi river delta. Regardless of the climate influences,
agricultural run off from "business as usual" economic activity is
driving greater environmental impacts than any Ocean Iron
Fertilization experiment ever has. As of yet, I am unaware of any
intentional ocean fertilization experiment that has had the impact of
a single dead zone of any river anywhere. The irony being that the
worst case scenarios imagined for any small ocean fertilization
experiment have yet to compare, by orders of magnitude, to the impact
of dead zones created from accepted practices. The hippocracy being
the deriders of ocean fertilization have nothing to say about the dead
zones.
http://news.nationalgeographic.com/news/2013/06/130621-dead-zone-biggest-gulf-of-mexico-science-environment/
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