Comprehensive new review of Monsanto's glyphosate underscores urgent need for global action
In a “state of the science” review released today, Pesticide Action Network (PAN) International presents a large body of
research documenting the adverse human health and environmental impacts of glyphosate and glyphosate-based herbicides
and underscores the need for these to be phased out globally. Environmental and health advocates say the monograph on
the world’s most widely used herbicide, commonly known as Roundup, should serve as a wake up call for regulators,
governments and users around the world.
Adverse human impacts detailed in the review include acute poisoning, kidney and liver damage, imbalances in the
intestinal microbiome and intestinal functioning, cancer, genotoxicity, endocrine disruption, reproductive and
developmental reduction, neurological damage, and immune system dysfunction.
Aggressive public relations and marketing by glyphosate’s developer, Monsanto, has resulted in the widespread perception
that the chemical is ‘safe’. Registration processes continue to allow its use without raising concerns about its safety
even as new data identifying adverse effects emerge.
This review dispels the so-called safety claims and highlights the urgent need to re-examine the authorization of
products containing glyphosate. A full chemical profile is presented, along with the regulatory status of products
containing glyphosate in many countries and information on viable alternatives.
Glyphosate is included in PAN International’s “List of Highly Hazardous Pesticides” (1) targeted for global phaseout.
The global network is calling for the herbicide to be replaced by agroecological approaches to weed management in
diversified cropping systems and non-crop situations.
Glyphosate is currently sprayed on numerous crops and plantations, including about 80% of genetically engineered (GE)
crops. It is also used as a pre-harvest desiccant, so crops such as wheat are uniform at harvest time. This practice
results in high glyphosate residues in foods. It is also widely used in home gardens and public places including
roadsides, and semi-natural and natural habitats. Due to its widespread use, residues are now detected in different
types of foods, drinking water, wine and beer; and even in non-food products derived from GM cotton. The extent of human
exposure is confirmed by the presence of glyphosate in human urine wherever it has been tested, principally in Europe
and North America. It has also been found in breast milk in the USA.
The 2015 classification by the International Agency for Research on Cancer (IARC) of glyphosate as a probable human
carcinogen has resulted in widespread concern about its continued use, especially pre-harvest and in public places.
Some countries, including Sri Lanka, Italy and France have imposed a partial ban and/or phase out of the spraying of
glyphosate in agriculture and in public areas. The European Union has extended approval for glyphosate for only 18
months instead of the usual 15 years.
Environmental impacts detailed in the monograph are no less concerning, and include adverse effects on ecosystem
functioning, pollination services, biological controls, soil fertility and crop health. Residues are widespread in the
environment, including in rainwater, surface and ground waters, and the marine environment. Glyphosate can persist in
some soils for up to 3 years; and there is some evidence of bioaccumulation.
Resistance to glyphosate is now recorded in 35 weed species and in 27 countries, mostly caused by the repeated use of
glyphosate in GE crops, no-till agriculture, and amenity use.
Soil & Health NZ Inc. past co-chair Dr Elvira Dommisse points out that, “the monograph also contains a useful section on
alternative weed management and provides information on a wide variety of non-chemical approaches to weed management in
various situations. These are people-friendly and environmentally-friendly, resulting in weed management that is benign
or even beneficial to ecosystems. We can and should embrace such methods to preserve and restore our soils and waterways
and to minimise health risks to human and animals.”