Pesticides are heavily used in conventional farms to protect food crops. But according to a recent study, about a third of global farmland today is at high risk of pesticide pollution.
Published Monday in Nature Geoscience, the study revealed that Asia houses the largest land areas that face an increased risk of pesticide pollution in countries like China, Japan, Malaysia and the Philippines.
Furthermore, the study showed that 34 percent of the high-risk areas are in places with high biodiversity, while about 19 percent are in low- and lower-middle-income nations. Another five percent are in water-scarce areas.
Global farmland at risk of pesticide pollution
To determine just how much of the world’s arable land is in danger of pesticide pollution, a team of researchers from the University of Sydney modeled pollution risk across 168 countries with data on the usage of 92 chemicals commonly used in pesticides and found widespread global pesticide pollution risk.
In particular, they found that about 64 percent, or some 24.5 million square kilometers, of global farmland was at risk of pollution from more than one chemical commonly used in pesticides.
Meanwhile, about 31 percent of global farmland was at high risk of pesticide pollution. In these farmlands, pesticide levels were more than 1,000 times higher than what industry standards consider “no observed effect concentration” (NOEC).
Farmland at high risk of pesticide pollution includes at least 60 percent of all European farmland, which are usually treated with dangerous levels of herbicides, fungicides and insecticides.
Furthermore, the researchers found that Asia has the largest land area at high risk of pesticide pollution. About 4.9 million square kilometers of arable land across Asia are at high risk, with China alone accounting for 2.9 million square kilometers of that land.
In addition, the researchers assessed the risk of pesticide pollution in terms of the type of environment, such as soil, surface water, groundwater and atmosphere. Of these, surface water is the most vulnerable because runoff can easily pollute waterways.
Lead author Fiona Tang also explained that the higher the levels of pesticide, the higher the probability of non-target species being negatively affected. Given their findings, Tang and her colleagues called for a global strategy to transition towards “sustainable agriculture and sustainable living” involving minimal pesticide use.
Pesticides as driver of biodiversity loss, major polluter
Pesticides allow commercial farmers to meet global food demand. But despite their advantages with regards to food production, pesticides are ubiquitous environmental pollutants for several reasons. (Related: EPA approves use of toxic pesticide previously banned for use on citrus.)
First, pesticides don’t contaminate soil alone. Through runoff and infiltration, these toxic chemicals can end up in both groundwater and surface waters, polluting those water sources and severely affecting their usability. Second, pesticides do not discriminate among insects, killing both harmful and beneficial ones like bees.
In contaminating both soil and water sources, pesticides pose a massive threat to terrestrial and aquatic animals. But as the global population grows, so does pesticide use.
In fact, pesticide use prompted growing fears over environmental damage, so much so that in 2019, the United Nations (UN) called for reduced pesticide use. The toxic chemicals were found to be a major driver of biodiversity loss. They were also found to be a major polluter of air, freshwater and seawater.
The study by Tang and her colleagues did not examine the impacts of pesticide use on human health. That said, they noted that the leaching of pesticides into water used for drinking could pose a real threat to human health.
Learn more about the environmental impacts of pesticide use in agriculture at Pesticides.news.
Divina Ramirez
Sources include:
DailyMail.co.uk
DownToEarth.org.in
FirstPost.com
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