There is enough land which can be used as plowland for even 9 or 10 billion people

At the moment 4.88 billion hectares of the earth’s landscape are used agriculturally.
Only 1.4 billion hectares of these are plowland. The rest – 3.48 billion hectares –  are pastures and meadows.

Only about 28 % of the 1.4 billion hectares plowland are used for direct food production. The rest are feed production, biofuel, plant fibers and biogas.

Even if the actual use of land as plowland gets extended, there still remains enough land for the destinated area of wild vegetation:

The actual plowland – 1.4 billion hectares – can be extended when pastures and meadows get a little smaller.

Pastures and meadows cover 3.48 billion hectares. This is quite as much as the world’s forest cover.

It seems very implausible that this huge area is necessary for livestock. If with a plowland of 1.4 billion hectares 8 billion people can be nourished – or could be nourished – then in order to feed 10 billion people we need not more than 1.8 billion hectares of plowland. Pastures and meadows would have to become less – 3.08 billion acres. It is possible.

There isn’t even competition between settlement areas and the destinated wild vegetation areas:

The exact share of the sealed soil is unknown.
Currently it’s estimated at 0.25 billion hectares. According to a prognosis it could be 0.4487 billion hectares in the year 2032 (scenario “economy first” – that is: go on as usual).

The conflict between settlement areas and the destinated vegetation area (wild vegetation) would be very limited:

The struggle could take place for 0.08 billion hectares of land, that is 1.7 % of the destinated vegetation area (wild vegetation).

 

Forest makes arable land fertile – it supplies for rain and nutrification

In order to stop the loss of plowland that is for example soil erosion, there are proposals like sustainable land use of acres and reafforestation of the surroundings.

Forests make soils stable and improve the surrounding plowland.

Sources:
German: http://www.globale-allmende.de/umwelt/biosphaere/landwirtschaft-flaechennutzung
English: https://en.wikipedia.org/wiki/Arable_land
https://www.theguardian.com/environment/2015/dec/02/arable-land-soil-food-security-shortage

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