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Plastic Eating Fungus | Earth Wise

May 26, 2023 By EarthWise Leave a Comment

More than five billion tons of plastic have accumulated on land and sea including the most remote regions of the planet as well as in the bodies of animals and humans. There is a compelling need to recycle as much plastic as possible but doing so is a major challenge. Plastic comes in many varieties and breaking it down for reuse requires different methods for each.

Polypropylene is one of the biggest challenges for recycling. It is a very common plastic used for all sorts of products including food containers, coat hangers, plastic wrap, toys, and much more. It accounts for roughly 28% of the world’s plastic waste, but only 1% of it is recycled.

Polypropylene is seldom recycled because it generally has a short life as a packaging material, and it often becomes contaminated by other materials and plastics. Thus, it generally ends up in landfills.

Researchers at the University of Sydney in Australia have discovered that two common strains of fungi were able to successfully biodegrade polypropylene. The fungi species – with unavoidable Latin names of Aspergillus terreus and Engyodontium album – are typically found in soil and plants.

The researchers found that the fungi were able to break down polypropylene after it had been pre-treated with either UV light or heat, by 21% over 30 days, and by 25-27% over 90 days. This seems rather slow but compared with the nearly endless life of polypropylene in landfills, it is a major improvement.

The hope is that methods like this could ultimately reduce the amount of plastic polluting the environment by encouraging plastic to biodegrade naturally under the appropriate conditions.

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Fungi makes meal of hard to recycle plastic

Photo, posted March 5, 2010, courtesy of Kevin Krejci via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Electrifying The Federal Fleet | Earth Wise

October 7, 2021 By EarthWise Leave a Comment

The federal government owns and operates about 645,000 vehicles. Among them are about 200,000 passenger vehicles, 78,000 heavy-duty trucks, 47,000 vans, 847 ambulances, and three limousines. About 225,000 vehicles are operated by the Postal Service.

Each year, these vehicles are driven about 4.5 billion miles and use about 400 million gallons of gasoline, producing 3.5 million tons of greenhouse gases.

President Biden signed an executive order in January directing federal officials to devise a plan for converting the entire fleet to clean and zero-emission vehicles. So far, the work has been slow.

According to a new report from Atlas Public Policy, accelerating the push for electric vehicles in the federal fleet could save taxpayers billions of dollars.

Electric vehicles have lower fueling and maintenance costs as well as a smaller environmental impact. According to the report, the government could replace 40% of its light-duty vehicles and buses not owned by the Postal Service with cheaper plug-in alternatives by 2025. By 2030, it could replace 97% of such vehicles with EVs for a lifetime savings of more than $1 billion. Furthermore, by 2025, it would be possible to replace nearly all mail trucks with EVs for a savings of $2.9 billion.

The federal fleet represents an opportunity to encourage transportation electrification to happen much more quickly. Apart from the economic and environmental benefits, having an electrified federal fleet would increase public awareness of the practicality and benefits of electric vehicles.

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Push to Electrify Federal Fleet Could Yield Billions in Savings by 2030

Photo, posted May 14, 2015, courtesy of Tony Webster via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Hyping Electric Cars | Earth Wise

March 13, 2020 By EarthWise Leave a Comment

During this year’s Super Bowl, at least three car companies – GM, Porsche, and Audi – ran commercials for plug-in cars. This is a sign that automakers are ramping up their efforts to persuade the public that electric cars really are the future.

The auto industry is investing billions of dollars to develop electric vehicles, spurred by stricter emissions rules in places like California and concerns about climate change. In fact, more than 100 new plug-in models are expected to become available in the United States over the next five years.

In Europe, electric cars are increasingly popular. Norwegians, for example, buy more electric cars than gas cars. And several European countries have banned the sale of gas cars starting in 2025.

But in the US, enthusiasm for electric cars has been slow to build. Automakers sold fewer than 330,00 electric vehicles in the US in 2019 and more than half of those were from Tesla, which actually does not even advertise its vehicles.

The auto industry spent nearly $9 billion in national and local advertising in the US last year, but less than half a percent of that went toward promoting electric vehicles.

A big part of the problem is that car dealers are not very enthusiastic about selling electric cars, which require far less maintenance than conventional cars and have far fewer costly replacement parts to sell. As a result, the industry’s efforts to speed the transition to electric cars has been ambivalent at best.

World-wide, Tesla has sold about a million cars, mostly in the past 4 years, so there is clearly a growing demand for electric vehicles. It is up to the rest of the industry to create demand for the new cars they have committed to produce.

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Super Bowl Ads Hyped Electric Cars. But Will Anyone Buy Them?

Photo, posted October 6, 2018, courtesy of Mike Fonseca via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Predicting Lightning Strikes

November 19, 2019 By EarthWise Leave a Comment

Lightning is one of the most unpredictable phenomena in nature. Approximately 100 lightning bolts strike earth’s surface every second, and each lightning bolt can contain up to one billion volts of electricity. Lightning regularly kills both people and animals and sets homes and forests on fire. It’s also been known to ground airplanes.

Researchers at EPFL – a research institute and university in Switzerland – have developed a novel way to predict where and when lightning will strike. The system relies on a combination of standard data from weather stations and artificial intelligence to predict lightning strikes to the nearest 10 to 30 minutes and within a radius of less than 20 miles. The simple and inexpensive system was outlined in a research paper recently published in Climate and Atmospheric Science, a Nature partner journal.

According to researchers, the current systems for predicting lightning strikes are slow, expensive, and complex, relying on external data acquired by satellite and radar. The new inexpensive system from EPFL uses real time data that can be obtained from any weather station, meaning it can cover remote regions that are out of radar and satellite range and where communication networks are lacking. The quick predictions from the system allow alerts to be issued before a storm has even formed.

The system uses a machine-learning algorithm that’s been trained to recognize conditions that lead to lightning. The researchers took into account atmospheric pressure, air temperature, relative humidity, and wind speed, among other things. After training the algorithm, the system was able to predict lightning strikes accurately nearly 80% of the time.

This system is a simple way to predict a complex phenomenon.

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