Brian Barton
Plastic pollution is one of the most pressing environmental issues, with an estimated 19 to 23 million tons of plastic waste entering our oceans annually. This plastic pollution is not only harmful to marine life but also has the potential to impact human health. The sources of this pollution are varied, from single-use plastics to inefficient garbage collection systems, and the consequences are far-reaching. With the amount of trash polluting our planet each day, it is essential to address the mounting crisis of climate change and explore sustainable solutions.
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What You'll Learn
The US produces 12% of the world's trash
The United States is responsible for 12% of the world's trash, despite accounting for only 4% of the global population. In 2018, the US generated 292 million tons of municipal solid waste (MSW) or 4.9 pounds per person per day. This waste comes from homes, businesses, and institutions such as universities and libraries. The majority of this waste (62%) ends up in landfills or is burned in incinerators, contributing to air pollution and the release of greenhouse gases.
The high level of waste generation in the US can be attributed to a consumption and disposal system where natural resources are extracted to produce goods that are often used only briefly before being discarded. This results in the waste of resources and pollution that threatens health, the environment, and the global climate. Plastic pollution, in particular, is a significant issue, with the US using 102.1 billion plastic bags each year. Plastic waste often ends up in oceans, rivers, and lakes, harming marine life and ecosystems.
Food waste is another major contributor to US trash production, but composting technology is helping to recycle food scraps. Nondurable goods such as clothing and newspapers account for 17.3% of US garbage, while yard trimmings make up 12.1%. The remaining waste includes durable goods like furniture and appliances, many of which could be repaired, repurposed, or recycled.
To reduce waste, individuals can take active steps such as using reusable bags, composting food waste, and reducing single-use plastic consumption. However, systemic changes are also needed, including improving sustainable waste management practices and incentivizing companies to reduce single-use and hard-to-recycle materials. Without significant changes, the world is facing a potential waste crisis, with landfill capacity already being reached in some countries.
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Plastic pollution in oceans
Humans produce over 400 million metric tons of plastic annually, and this number is projected to increase. Plastic is now so pervasive that it can be found in every ocean on Earth, with billions of pounds of plastic making up about 40% of the world's ocean surfaces. It is estimated that there are 15 to 51 trillion pieces of plastic in the oceans, with the amount growing daily. Every day, the equivalent of 2,000 garbage trucks full of plastic is dumped into the oceans, rivers, and lakes.
The plastic in the oceans comes from thousands of sources all over the world. Rivers are the main source of ocean plastic pollution, but another major source of plastic in the Great Pacific Garbage Patch is fishing gear. The Great Pacific Garbage Patch, located in the North Pacific Ocean between Hawaii and California, is the most polluted and best-studied of the five gyres in our oceans. It is estimated to be twice the size of Texas and contains 1.8 trillion pieces larger than 0.5mm. About 92% of the floating plastic mass in the Great Pacific Garbage Patch consists of larger objects, which are continually fragmenting into smaller pieces that are much harder to clean up.
The plastic in the oceans is consumed by marine species, from fish to mammals to birds to crustaceans. It is estimated that 60% of all seabird species have eaten pieces of plastic, with that number predicted to increase to 99% by 2050. Tragically, research indicates that half of the sea turtles worldwide have ingested plastic, which can cause them to choke, sustain internal injuries, or starve by making them feel full. Marine mammals also ingest plastic and get tangled up in it, with endangered wildlife like Hawaiian monk seals and Pacific loggerhead sea turtles among the nearly 1,500 species that eat and get caught in plastic litter.
The impact of plastic pollution extends beyond the direct harm it causes to marine life. Plastic pollution can alter habitats and natural processes, reducing ecosystems' ability to adapt to climate change and directly affecting millions of people's livelihoods, food production capabilities, and social well-being. Additionally, the fossil fuel industry's plans to increase plastic production will lead to more toxic air pollution and plastic in our oceans. The durability of plastic means that "every bit of plastic ever made still exists," and urgent action is needed to address this growing crisis.
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Methane emissions from landfills
The amount of trash polluting the planet is a pressing issue. Over two billion metric tons of human-generated waste are thrown away globally each year, polluting ecosystems around the world. Municipal solid waste (MSW) landfills are the third-largest source of human-related methane emissions in the United States, accounting for approximately 14.4% of these emissions in 2022. Methane is a potent greenhouse gas, at least 28 times more effective than carbon dioxide at trapping heat in the atmosphere over a 100-year period, according to the latest Intergovernmental Panel on Climate Change (IPCC) assessment report (AR5).
Landfill gas (LFG) is a natural byproduct of the decomposition of organic material in landfills, composed of roughly 50% methane and 50% carbon dioxide, along with small amounts of other organic compounds. When MSW is first deposited in a landfill, it initially undergoes aerobic decomposition, producing little methane. However, within less than a year, anaerobic conditions are established, and methane-producing bacteria begin to decompose the waste and generate methane.
Food waste, which comprises about 24% of MSW, is a significant contributor to methane emissions from landfills due to its rapid decay rate. An estimated 58% of fugitive methane emissions from MSW landfills originate from landfilled food waste. To address this issue, the EPA has developed tools such as the "Quantifying Methane Emissions from Landfilled Food Waste" report and the Avoided Landfilled Food Waste Methane Emissions Calculator, aiding in estimating methane emissions reductions per ton of food waste diverted from landfills.
The impact of landfill methane emissions extends beyond climate change. Methane escaping into the atmosphere contributes to local smog and global climate change. Advanced monitoring strategies, including remote sensing from satellites, aircraft, and drones, have revealed that landfill point source emissions have a disproportionately large impact on pollution. This highlights the need for improved measurement and mitigation strategies to address this often-underestimated source of methane emissions.
While the total emissions from MSW landfills are decreasing, methane emissions from landfilled food waste are on the rise. This trend underscores the importance of diverting food waste from landfills as a crucial strategy to reduce methane emissions. By implementing innovative waste management practices and utilizing LFG as a renewable energy resource, we can mitigate the environmental and health consequences of methane emissions from landfills.
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The impact of trash on human health
Air pollution is another significant concern. Incinerator emissions release heavy metals, mercury, and cancer-causing pollutants like dioxin into the atmosphere. Mercury, a neurotoxin, impairs brain function, while long-term exposure to air pollutants can increase the risk of respiratory issues and other health complications. Additionally, greenhouse gas emissions from landfills, primarily methane and carbon dioxide, contribute to climate change. Climate change itself is a significant threat to human health, as it intensifies the frequency and severity of extreme weather events, leading to heatwaves, droughts, and floods, which can have devastating impacts on human lives and well-being.
Trash also impacts mental health and well-being. The presence of excessive garbage on streets and in neighbourhoods can be unsightly and depressing, discouraging outdoor activities and affecting people's mental health as they navigate their daily lives. It can also attract pests like cockroaches and rats, which can contaminate food sources and transmit diseases, including asthma and other respiratory issues. The stress and anxiety associated with living in such conditions can have detrimental effects on overall mental health and quality of life.
The consumption and disposal patterns of modern society further exacerbate the problem. The linear material economy, prevalent in countries like the United States, involves extracting materials, producing goods, and disposing of waste in a one-way process, generating massive amounts of trash. This system results in the waste of precious resources and contributes to pollution, threatening human health and the environment. High-income countries, representing only 16% of the global population, are responsible for 34% of the world's trash, underscoring the urgent need for reduced consumption and improved waste management practices.
To mitigate the impact of trash on human health, a shift towards a circular economy is essential. This involves incentivizing the reduction of consumption, promoting recycling, and reusing materials in a continuous loop. By minimizing waste generation and properly disposing of remaining waste, we can protect public health, conserve natural resources, and address the pressing challenges posed by climate change.
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The recycling rate of plastic
According to the US Environmental Protection Agency (EPA), the recycling rate of plastics was 8.7% in 2018, with three million tons of plastic recycled. This is a small amount when compared to the total amount of plastic waste generated. The EPA's data on the recycling of plastic comes from the American Chemistry Council, the National Association for PET Container Resources, and the Association of Plastic Recyclers.
The recycling rate for specific types of plastic containers is more significant. For instance, the recycling rate of PET bottles and jars was 29.1% in 2018, while the rate for HDPE natural bottles was 29.3% in the same year. However, Greenpeace has found that no plastic meets the threshold to be considered "recyclable", which is a recycling rate of 30%. According to Lisa Ramsden, a senior plastic campaigner for Greenpeace USA, plastic production is increasing, but the percentage of plastic being recycled is decreasing.
The National Association for PET Container Resources, an industry trade group, found that in 2017, only 21% of plastic bottles collected for recycling were turned into new products. This is in contrast to claims made by the oil and gas industry that they plan to recycle every piece of plastic they produce by 2040. Industry officials have been unable to explain how they plan to achieve a 100% recycling rate.
The recycling of plastic is challenging due to the high cost of collecting and sorting the thousands of different types of plastic, which cannot be melted down together. Environmentalists and lawmakers in some states are pushing for legislation to ban single-use plastics and incentivize the return of plastic bottles through "bottle bills". These bills have led to successful recycling rates for plastic bottles in certain states, but they face resistance from the plastic and oil industries.
The EPA has released the "National Strategy to Prevent Plastic Pollution", which aims to eliminate plastic pollution in the environment. Plastic is a rapidly growing component of municipal solid waste (MSW), with containers and packaging accounting for the most plastic tonnage in 2018. Overall, the low recycling rate of plastic contributes to the global problem of plastic pollution, with an estimated 19 to 23 million tons of plastic waste entering aquatic ecosystems each year.
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Frequently asked questions
It is estimated that over 2 billion metric tons of unsustainable, human-generated waste are thrown away globally each year, which equates to roughly 5.4 million tons of trash per day.
Americans throw out 4.9 pounds of trash per person every day, which is nearly 1,800 pounds of materials per American every year.
An estimated 16.5 to 23 million tons of plastic waste is dumped into the ocean each year. This is the equivalent of 2,000 garbage trucks full of plastic being dumped into the world's oceans, rivers, and lakes every day.
