How Proper Crop Protection Ensures Global Food Safety and Helps the Planet
By J. Erik Fyrwald
World Food Safety Day earlier this week reminded us of a harsh reality: Roughly 600 million people around the world suffer from food-borne illnesses, while an estimated 3 million die from illnesses contracted from unsafe food or water.
This annual toll touches every part of the world, though the worst impacts are felt in regions like sub-Saharan Africa and South Asia, where there is less access to refrigeration and other modern food-preservation technologies. While major improvements have been achieved in some regions since the 1980s, the problem is still vast and urgent.
Dangers in food supply can occur at any stage of the farm-to-fork process. Many of these relate to food preparation, and every cook must take all available precautions to maintain a clean, safe kitchen. Less well known is what can be done to ensure food safety earlier in the process, beginning on the farms where it is produced.
Agronomists Have an Outsized Role to Play
In recent decades, thanks to successful research and development in the field of agronomy, a wide variety of crop protection products have provided farmers with a set of carefully tailored tools for the production of safe and healthy crops.
For example, Fusarium is a common fungus that can produce deadly mycotoxins in wheat, corn and barley. Recently developed broad-spectrum fungicides are now being used to prevent the spread in these crops. These agents play an active role in protecting the health of consumers and avoiding waste in having to destroy the infected grains.
In the past, pesticides, herbicides and fungicides have themselves sometimes been viewed as threats to the safety of food and water.
But innovation in crop protection products has come a long way since Rachel Carson pointed out the risk they posed in her seminal 1962 book Silent Spring. Today's crop protection agents are developed with both human health and the environment firmly in view.
Over the course of the last 60 years, these agents have become more targeted and more effective and they are applied much more sparingly. Since the 1950s, the agronomy sector has achieved a remarkable 95% decrease in the average application rate of active ingredients per hectare. At the same time, multiple innovations have led to crop yields from farmland more than tripling. These measures to make everyone's food safer have been reinforced with the Codex Alimentarius, the open, transparent system of international standards established in 1963 to protect consumer health and promote fair practice in the food trade.
Crop-protection has been used more sparingly over recent decades. Source: Phillips McDougall, 2017
A Deep Respect for Health and the Environment
As it happens, more than a few of today's crop protection products are obtained from natural sources or are so thoroughly tested by time that they are considered traditional practices. This means they are commonly found in use on farms that specialize in growing organic produce.
Those of us working in the field of agricultural science are well aware these advances are not always appreciated by people who wish insecticides and fungicides were not a part of the global food system. Viewed in a certain light, I agree with them. But I have seen first-hand the destruction wrought by pests and the impact of a failed crop on farmers and their families. The devastation inflicted by swarms of locusts this year in Africa and Asia is just one case in point.
Addressing the Challenge of Climate Change
The need for effective crop protection products has steadily grown as rising global temperatures have expanded the range of many pests and blights. Just last summer in the Netherlands, a farmer told me he was seeing an insect in his fields he had never seen before.
Our team researched it and found the pest was well known in Brazil – Tuta absoluta is a miner fly whose larvae make corridors in the leaves by eating the cells – and becoming a problem in northern climates as a result of warmer winters. One of our goals as an industry is to provide farmers with the safest and best means of keeping threats like these at bay.
When viewed at macroscopic scale, advances in agronomy clearly represent an important part of the solution to climate change. The latest crop protection products address climate change directly – by enabling farmers to produce more food per unit of land than ever before in the history of agriculture. This is critical if we hope to bring a halt to the expansion of human activity into regions such as the Amazon rainforest – a precious natural resource that serves a higher common purpose as a carbon sink and biodiversity preserve than as a cornfield.
Progress has been made on crop protection solutions that help feed humanity safely while protecting the environment, but we should all take a moment on this World Food Safety Day to strengthen our resolve. Even in the face of a global pandemic and myriad other challenges – we must keep moving forward in our efforts to safeguard people and the planet.
Reposted with permission from World Economic Forum.
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If you get a call from a number you don't recognize, don't hit decline — it might be a contact tracer calling to let you know that someone you've been near has tested positive for the coronavirus.
Interviews With Contact Tracers<p>Contact tracing is a public health strategy that involves identifying everyone who may have been in contact with a person who has the coronavirus. Contact tracers collect information and provide guidance to help contain the transmission of disease.</p><p>It's been used during outbreaks of sexually transmitted infections (STIs), Ebola, measles, and now the coronavirus that causes COVID-19.</p><p>It starts when the local department of health gets a report of a confirmed case of the coronavirus in its community and gives that person a call. The contact tracer usually provides information on how to isolate and when to get treatment, then tries to figure out who else the person may have exposed.</p><p>"We ask who they've been in contact with in the 48 hours prior to symptom onset, or 2 days before the date of their positive test if they don't have symptoms," said <a href="https://case.edu/medicine/healthintegration/people/heidi-gullett" target="_blank">Dr. Heidi Gullett</a>, associate director of the Center for Community Health Integration at the Case Western Reserve University School of Medicine and medical director of the Cuyahoga County Board of Health in Ohio.</p>
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Why You Should Participate (and What Happens If You Don’t)<p>A <a href="https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30457-6/fulltext" target="_blank">Lancet study</a> from June 16, which looked at data from more than 40,000 people, found that COVID-19 transmission could be reduced by 64 percent through isolating those who have the coronavirus, quarantining their household, and contacting the people they may have exposed.</p><p>The combination strategy was significantly more effective than mass random testing or just isolating the sick person and members of their household.</p><p>However, contact tracing is only as effective as people's willingness to participate, and a small number of people who've contracted the coronavirus or were potentially exposed are reluctant to talk.</p><p>"Contact tracers have all been hung up on, cussed at, yelled at," said Gullet.</p><p>The hesitation to talk to contact tracers often stems from concerns over privacy — a serious issue in healthcare.</p>
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Climate Explained is a collaboration between The Conversation, Stuff and the New Zealand Science Media Centre to answer your questions about climate change.
If you have a question you'd like an expert to answer, please send it to firstname.lastname@example.org
What was the climate and sea level like at times in Earth’s history when carbon dioxide in the atmosphere was at 400ppm?<p>The last time global carbon dioxide levels were consistently at or above 400 parts per million (ppm) was around <a href="https://www.nature.com/articles/nature14145" target="_blank">four million years ago</a> during a geological period known as the <a href="http://www.geologypage.com/2014/05/pliocene-epoch.html" target="_blank">Pliocene Era</a> (between 5.3 million and 2.6 million years ago). The world was about 3℃ warmer and sea levels were higher than today.</p><p>We know how much carbon dioxide the atmosphere contained in the past by studying ice cores from Greenland and Antarctica. As compacted snow gradually changes to ice, it traps air in bubbles that contain <a href="https://www.cambridge.org/core/journals/annals-of-glaciology/article/enclosure-of-air-during-metamorphosis-of-dry-firn-to-ice/09D9C60A8DA412D16645E6E6ABC1892F" target="_blank">samples of the atmosphere at the time</a>. We can sample ice cores to reconstruct past concentrations of carbon dioxide, but this record only takes us back about a million years.</p><p>Beyond a million years, we don't have any direct measurements of the composition of ancient atmospheres, but we can use several methods to estimate past levels of carbon dioxide. One method uses the relationship between plant pores, known as stomata, that regulate gas exchange in and out of the plant. The density of these stomata is <a href="https://journals.sagepub.com/doi/abs/10.1177/095968369200200109" target="_blank">related to atmospheric carbon dioxide</a>, and fossil plants are a good indicator of concentrations in the past.</p><p>Another technique is to examine sediment cores from the ocean floor. The sediments build up year after year as the bodies and shells of dead plankton and other organisms rain down on the seafloor. We can use isotopes (chemically identical atoms that differ only in atomic weight) of boron taken from the shells of the dead plankton to reconstruct changes in the acidity of seawater. From this we can work out the level of carbon dioxide in the ocean.</p><p>The data from four-million-year-old sediments suggest that <a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2010PA002055" target="_blank">carbon dioxide was at 400ppm back then</a>.</p>
Sea Levels and Changes in Antarctica<p>During colder periods in Earth's history, ice caps and glaciers grow and sea levels drop. In the recent geological past, during the most recent ice age about 20,000 years ago, sea levels were at least <a href="https://science.sciencemag.org/content/292/5517/679.abstract" target="_blank">120 meters lower</a> than they are today.</p><p><span></span>Sea-level changes are calculated from changes in isotopes of oxygen in the shells of marine organisms. For the Pliocene Era, <a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2004PA001071" target="_blank">research</a> shows the sea-level change between cooler and warmer periods was around 30-40 meters and sea level was higher than today. Also during the Pliocene, we know the West Antarctic Ice Sheet was <a href="https://www.nature.com/articles/nature07867" target="_blank">significantly smaller</a> and global average temperatures were about 3℃ warmer than today. Summer temperatures in high northern latitudes were up to 14℃ warmer.</p><p>This may seem like a lot but modern observations show strong <a href="https://journals.ametsoc.org/jcli/article/23/14/3888/32547" target="_blank">polar amplification</a> of warming: a 1℃ increase at the equator may raise temperatures at the poles by 6-7℃. It is one of the reasons why Arctic sea ice is disappearing.</p>
Impacts in New Zealand and Australia<p>In the Australian region, there was no Great Barrier Reef, but there may have been <a href="https://link.springer.com/content/pdf/10.1007/BF02537376.pdf" target="_blank">smaller reefs along the northeast coast of Australia</a>. For New Zealand, the partial melting of the West Antarctic Ice Sheet is probably the most critical point.</p><p>One of the key features of New Zealand's current climate is that Antarctica is cut off from global circulation during the winter because of the big <a href="https://www.tandfonline.com/doi/abs/10.3402/tellusa.v54i5.12161" target="_blank">temperature contrast</a> between Antarctica and the Southern Ocean. When it comes back into circulation in springtime, New Zealand gets strong storms. Stormier winters and significantly warmer summers were likely in the mid-Pliocene because of a weaker polar vortex and a warmer Antarctica.</p><p>It will take more than a few years or decades of carbon dioxide concentrations at 400ppm to trigger a significant shrinking of the West Antarctic Ice Sheet. But recent studies show that <a href="http://nora.nerc.ac.uk/id/eprint/521027/" target="_blank">West Antarctica is already melting</a>.</p><p>Sea-level rise from a partial melting of West Antarctica could easily exceed a meter or more by 2100. In fact, if the whole of the West Antarctic melted it could <a href="http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.695.7239&rep=rep1&type=pdf" target="_blank">raise sea levels by about 3.5 meters</a>. Even smaller increases raise the risk of <a href="https://www.pce.parliament.nz/publications/preparing-new-zealand-for-rising-seas-certainty-and-uncertainty" target="_blank">flooding in low-lying cities</a> including Auckland, Christchurch and Wellington.</p>
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