France Will Build More Than 600 Miles of Solar-Powered Roadways

France may soon be the world’s leader in solar-powered roadways. Ségolène Royal, the country’s minister of ecology, announced a plan last month to pave more than 600 miles of French roads with photovoltaic panels, beginning this spring. The project will be completed over the next five years.

Made by Colas, a construction company that has been working on the technology for five years, the photovoltaic tiles are designed to stay warm enough to prevent ice from forming on top of them, and to withstand the weight of cars. According to the French plan, 1 kilometer of solar road (.6 miles) could power a town of 5000 people for a year. Should it work, the solar road network would provide 8 percent of the country’s population with electricity.

Some critics argue that solar roads will be too expensive to be worthwhile on a large scale, so France’s project will provide a more definitive test of the technology’s capabilities (or drawbacks). The photovoltaic cells will have to hold up under the impact of heavy traffic (including trucks) and remain safe in winter conditions.

France is not the first country to invest in solar roads, but it would be the first to do so for vehicular highways. A U.S. solar road project—funded by the U.S. Department of Transportation and more than $2 million raised on Indiegogo—is currently in the research phase, but has not begun a pilot test yet. South Korea and the Netherlands, on the other hand, are both experimenting with solar panels installed on bike lanes. Korea’s are installed on a structure on top of the bike lane, shading the cyclists below, while the Dutch solar panels are buried within the bike path itself. In 2015, the 328-foot-long Dutch pilot was able to generate enough power to run three homes for a year.

[h/t Co.Exist]

All images courtesy Colas.

nextArticle.image_alt|e
iStock
Air Quality in American National Parks and Big Cities Is Roughly the Same
iStock
iStock

National parks usually have more vegetation, wildlife, and open spaces than urban areas, but the two don't look much different when it comes to air quality. As City Lab reports, a new study published in Science Advances found that U.S. national parks and the nation's largest cities have comparable ozone levels.

For their research, scientists from Iowa State University and Cornell University looked at air pollution data collected over 24 years from 33 national parks and the 20 most populous metro areas in the U.S. Their results show that average ozone concentrations were "statistically indistinguishable" between the two groups from 1990 to 2014.

On their own, the statistics look grim for America's protected areas, but they're actually a sign that environmental protection measures are working. Prior to the 1990s, major cities had higher ozone concentrations than national parks. At the start of the decade, the federal government passed the Clean Air Act (CAA) Amendments in an effort to fight urban air pollution, and ozone levels have been declining ever since.

The average ozone in national parks did increase in the 1990s, but then in 1999 the EPA enacted the Regional Haze Rule, which specifically aims to improve air quality and visibility in national parks. Ozone levels in national parks are now back to the levels they were at in 1990.

Ground-level ozone doesn't just make America's national parks harder to see: It can also damage plants and make it difficult for human visitors to breathe. Vehicles, especially gas-guzzling trucks and SUVs, are some of the biggest producers of the pollutant.

[h/t City Lab]

nextArticle.image_alt|e
iStock
Animal Welfare Groups Are Building a Database of Every Cat in Washington, D.C.
iStock
iStock

There are a lot of cats in Washington, D.C. They live in parks, backyards, side streets, and people's homes. Exactly how many there are is the question a new conservation project wants to answer. DC Cat Count, a collaboration between Humane Rescue Alliance, the Humane Society, PetSmart Charities, and the Smithsonian Conservation Biology Institute, aims to tally every cat in the city—even house pets, The New York Times reports.

Cities tend to support thriving feral cat populations, and that's a problem for animal conservationists. If a feline is born and grows up without human contact, it will never be a suitable house cat. The only options animal control officials have are to euthanize strays or trap and sterilize them, and release them back where they were found. If neither action is taken, it's the smaller animals that belong in the wild who suffer. Cats are invasive predators, and each year they kill billions of birds in the U.S. alone.

Before animal welfare experts and wildlife scientists can tackle this problem, they need to understand how big it is. Over the next three years, DC Cat Count will use various methods to track D.C.'s cats and build a feline database for the city. Sixty outdoor camera traps will capture images of passing cats, relying on infrared technology to sense them most of the time.

Citizens are being asked to help as well. An app is currently being developed that will allow users to snap photos of any cats they see, including their own pets. The team also plans to study the different ways these cats interact with their environments, like how much time pets spend indoors versus outdoors, for example. The initiative has a $1.5 million budget to spend on collecting data.

By the end of the project, the team hopes to have the tools both conservationists and animal welfare groups need to better control the local cat population.

Lisa LaFontaine, president and CEO of the Humane Rescue Alliance, said in a statement, “The reality is that those in the fields of welfare, ecology, conservation, and sheltering have a common long-term goal of fewer free-roaming cats on the landscape. This joint effort will provide scientific management programs to help achieve that goal, locally and nationally."

[h/t The New York Times]

SECTIONS

arrow
LIVE SMARTER
More from mental floss studios