David Cox - The planet's prodigious poo problem
Recent research has estimated that by 2030, the planet will be generating at least
5bn tonnes of
poo each year, with the vast majority being deposited by livestock. With 80%
of farms in the Netherlands already producing more cow dung than they
can legally use as fertiliser, and China resorting to drastic
measures to try to reduce the amount of manure being discharged into
rivers, scientists say this is a major environment and health challenge.
“It’s a huge problem,”
says Joe Brown, professor of environmental engineering at Georgia Institute of
Technology. “Animal waste is going up because as populations and wealth
increase, there’s a bigger demand for protein. But while we’ve seen lots of
initiatives to safely manage human waste, nobody is talking about this.” Despite extensive
Environmental Agency regulations, the UK’s dairy, poultry and pig farms were
responsible for 424
incidents of serious pollution related to waste disposal between 2010
and 2016. With the UK’s cows
already producing 36m tonnes in waste every year – enough to fill the Shard 78
times over – and many dairy farmers feeling the pinch from tumbling milk
prices, safely disposing of these mounds of toxic mess is a serious and
expensive conundrum.
Because most first world
farming systems are highly concentrated, industrial operations, this produces
very concentrated streams of waste. Unless these are dealt with rapidly, they
can pollute
the air with large amounts of harmful gases such as ammonia, nitrous
oxide and hydrogen sulphide.
Inhaling these toxic
fumes can be lethal in large quantities, and studies have repeatedly shown that
people who live near industrial farms have a much greater risk of chronic
asthma, respiratory
irritation, immune
suppression, and even mood
disorders.
Water pollution and
climate change are also issues. Moreover, the
greenhouse gas methane is produced in large quantities when waste is left to
decay uncontrollably. Many scientists believe animal waste is already a vastly
overlooked component of climate change. read more:
https://www.theguardian.com/news/2019/mar/25/animal-waste-excrement-four-billion-tonnes-dung-poo-faecebookThe Origin of Faeces, David Waltner-Toews