>And to the sahara, which was a wheat production centre of roman times?
>This was a shift in climate. Possibly also caused by humans.
>By deforestation, overgrazing, unknowing destroying ecosystems.
>There *are* antic destroyed ecosystems.
>But not by farming. Normally by deforestation.

DEforestation first , tiling the ground second , diminishing the variety of
species third.

The reduction of leaf surface evaporation have a huge impact on climates.
For the water to be available you need a dense  deep network of roots plus a
great leaf surperficy. Farming compromise this .
>
>Have you seen the beautiful landscapes of France or Germany?
>Exactely *these* have been under a natural agricultural regime
>from 4400 BC to 1900 AD. 6300 years of successful production.
>The danger of change is *now*, by industry agriculture.
>It needed only a few thousand years, because 7000 years back
>the earth was comparable to today.

I urge you to have an experience of a virgin land and you will see the
europeans landscapes as very poor..
What i used to consider beautifull fertiles lands in The wild frontier of
Europe ( the pyrennees) seemed  very depleted when i cam here.

jean-claude
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>Compost is great for build
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>>When you took over your land the fertility have been compromised to say
the
>>least ( bulldozing,  deforestation, may be tilled for many years ....) so
>>bringing compost was a quick way to restore some fertility. by bringing
>more
>>than you loose in the tilling.
>>so i will restate by saying that,  only nature is able to increase top
soil
>>without having to steal the biomass from somewhere else.
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>>There is no time or space to not want to adress the root of  the global
>loss
>>of biomass ,fixing problems created by tiling is not going to be enough.
We
>>have to question our interferences into the natural fertilisation process.
>>jean-claude