Environment & Energy
Related: About this forum"All of the world's top soil could be gone within 60 years"
ROME (Thomson Reuters Foundation) - Generating three centimeters of top soil takes 1,000 years, and if current rates of degradation continue all of the world's top soil could be gone within 60 years, a senior UN official said on Friday. About a third of the world's soil has already been degraded...
The causes of soil destruction include chemical-heavy farming techniques, deforestation which increases erosion, and global warming. The earth under our feet is too often ignored by policymakers, experts said.
"Soils are the basis of life," said Semedo, FAO's deputy director general of natural resources. "Ninety five percent of our food comes from the soil."
Unless new approaches are adopted, the global amount of arable and productive land per person in 2050 will be only a quarter of the level in 1960, the FAO reported, due to growing populations and soil degradation.
More...
https://www.scientificamerican.com/article/only-60-years-of-farming-left-if-soil-degradation-continues/2014-12-05T165713Z_1_KCN0JJ1R9_RTROPTT_0_US-FOOD-SOIL-FARMING.XML
Another source:
Humans have destroyed a third of Earths farmland in 40 years | Science | AAAS
https://www.sciencemag.org/news/2015/12/humans-have-destroyed-third-earth-s-farmland-40-years
Duppers
(28,117 posts)Perhaps we can grow food there.
Or build a wall at our boarder at a cost close to $1 Billion per mile.
Billy Ray Joe Bob.
(65 posts)It's amazing how science fiction from 50 years ago is becoming reality. It appears that humankind is a temporary biological infestation of the planet earth and our visit here will be short as time is measured. From overpopulation to massive pollution of the oceans with plastic and industrial waste it seems grim . Sadly we will take many species with us.
MasonDreams
(756 posts)How to green the world's deserts and reverse climate change
Too many people , too many cars , not enough sanity.
There are solutions though.
Linda Ed
(493 posts)Robert Mercer wants in on the new Glencore controlled sulfide mine in Minnesota. The same Glencore that is in up to its eyebrows with Putins pal Oleg Deripaska.
Mercer Global Advisors Inc. ADV Acquires New Position in Polymet Mining Corp (PLM)
https://mayfieldrecorder.com/2019/05/24/mercer-global-advisors-inc-adv-acquires-shares-of-109269-polymet-mining-corp-plm.html
Ask @amyklobuchar , @TinaSmithMN and @PeteStauber why they support sulfide mining near the Boundary Waters and Lake Superior Watershed, and why we should give up our clean water to mine copper and nickel that will probably go to the Russians. Richard Painter
Kablooie
(18,612 posts)I was afraid we were running out of worries.
I shouldn't have worried.
no_hypocrisy
(46,038 posts)mopinko
(70,023 posts)called composting. and on a larger scale, hugelkultur.
both can be used to produce new soil, and protect against erosion and runoff.
the 1/3 of our agricultural output that ends up rotting should get back to the land, some land, somewhere.
NickB79
(19,224 posts)Making and applying millions of tons of compost to all the 1000-acre cornfields in the Midwest, running how many semis to haul it? Running $250,000 combines through a field of hugelkultur beds? To say nothing of how more hungry modern hybrid crops are for nutrients, draining the soil faster than in generations past, or how we remove millions of tons of biomass annually for biofuels.
Your solutions would work 150 yr ago, when farmers were small, rotating fields and returning livestock wastes to the land. But there werent 7 billion people around at that time either.
mopinko
(70,023 posts)even like here, where the solids from waste water are spread on farms, we have made it a much better amendment by mixing it roughly 50/50 w woodchips.
the waste from urban forestry is enormous.
farmers could get paid to take tree waste, ring the fields and make dams to stop run off, then plow it in once it has totally decomposed. slow, but worthwhile.
and smaller farms are def a thing that is happening. and they could well be the last resort. so they are not a small part of the puzzle.
not saying the above is a perfect replacement, but it is sure a big piece of the puzzle.
i created about 500 cubic yards of delicious, productive soil to start my farm. it was mostly free to me, besides the cost of acquiring and maintaining a bobcat.
most of the material was from within a mile of my place, saving about 100 trips by big diesel truck of about 50 mi each way.
it requires no till techniques, but that is a thing these days, too.
Progressive dog
(6,899 posts)and their soils are still disappearing.
The huge farm yields to feed a huge human population became possible because of manufactured fertilizers, pesticides, plant and animal breeding (including GMO), no till agriculture, irrigation, and mechanization. Take any of those away and millions of people will starvw.
Calculating
(2,955 posts)Maybe someday humanity will get the hint that this planet cannot support 7+ billion people sustainably and people will stop having kids.
The_jackalope
(1,660 posts)The truly sustainable population of the planet is probably no more than 100 million hunter-foragers. But once the current cycle of civilization gets done raping the place, it will probably support a tenth of that.
The prospects for humans worldwide to decide to stop having kids are vanishingly remote.
Bayard
(22,011 posts)Not only does it open the land to be ravaged, it removes protection from wind and erosion.
It also decimates native wildlife:
https://www.democraticunderground.com/?com=view_post&forum=1127&pid=127950
Duppers
(28,117 posts)Vegetation.