[Pil-pc-oceania] - Desert Greening

[RussGrayson]

Deserts occupy a zone roughly around the 30 degree north and south
latitudes. 

This is due to global atmospheric circulation in the form of Hadley Cells,
so I understand. Warm, moist air rising at the equator sheds its heat and
moisture and descends as drier air in the 30 degree N & S latitudes. Thus,
deserts are maintained by a drier air stream.

So, deserts are a natural phenomenon and can be scaled up with a little help
from people.

Somebody with a knowledge of geography or atmospheric physics could explain
this clearr and in more detail.

...Russ


On 11/9/07 12:22 PM, "Laurence Gaffney" <l.gaffney at bigpond.com> wrote:

> Martin Naylor wrote:-
>>    "What is this about desert greening, deserts are a vital part of the
>> earths web of life, may be we should start blowing up the mountains and
>> bulldoze the rest to one end tilt the earth back and have a perpetual summer
>> Bill might have had one too many when this popped into his brain cells, i
>> have no problem with reclaiming what has been lost"
> 
> It is my understanding that most if not all of the earths deserts are the
> result of the activities of humans.
> 
> Laurence Gaffney
> _______________________________________________
> Pil-pc-oceania mailing list
> Pil-pc-oceania at lists.permacultureinternational.org
> http://jasper.cmsarchitects.com/mailman/listinfo/pil-pc-oceania