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Australian Plastic Bag Ban

December 31, 2018 By EarthWise Leave a Comment

Last summer, the two largest supermarket chains in Australia – Coles and Woolworth’s – decided to stop offering single-use disposable plastic bags to customers.  The initial public reaction was decidedly negative.   However, within just three months after the radical change, the country’s National Retail Association reported an 80% drop in the consumption of plastic bags nationwide.

In that three-month period, it is estimated that 1.5 billion bags have been prevented from use.   Some retailers are reporting reduction rates as high as 90% in the use of the bags.  The move by the big supermarkets has paved the way for smaller businesses to follow suit. The smaller businesses typically can’t afford to risk the wrath of their customers with a major change like this. Customers have to learn to bring their own bags or buy reusable bags at the store.

In much of Australia, the phase-out of plastic bags has been legislated, but the state of New South Wales, home to Sydney, the country’s largest city, has not enacted such legislation. So, supermarkets themselves are doing the work of getting rid of the bags.

The change has not been without hiccups.  For the first couple of months after the plastic bag ban was put in place, Woolworth’s saw poor sales in its stores.  However, customers eventually got used to the new way of doing things and sales levels returned.

Disposable plastic bags often find their way into the oceans where they break down into microparticles. Studies have shown that these plastic bits are ingested by a wide variety of marine life.  For example, a UK study found that 100% of sea turtles in the Pacific and Atlantic oceans as well as the Mediterranean Sea had plastic in their digestive systems.

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Australia-wide ban leads to ’80 per cent drop’ in plastic bag consumption

Photo, posted September 18, 2018, courtesy of Matthew Paul Argall via Flickr.  

Earth Wise is a production of WAMC Northeast Public Radio.

A Better Filter For Saltwater

November 26, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/10/EW-11-26-18-A-Better-Saltwater-Filter.mp3

Turning seawater into drinkable water is a highly desirable capability given that fresh water is generally in short supply and seawater is endlessly abundant.  Desalination plants typically strain salt out of seawater by pumping it through films made of polyamide.  Polyamide filters are riddled with tiny pores that allow water molecules to squeeze through, but not sodium ions.

[Read more…] about A Better Filter For Saltwater

Heat-Resistant Corals

August 31, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/08/EW-08-31-18-Heat-Resistant-Corals.mp3

All over the world, coral reefs are being wiped out by rising sea temperatures brought about by climate change.  When sea temperatures get too high, the symbiotic relationship between coral polyps and microscopic algae living within the coral breaks down and the coral either digests or expels the algae.   The result is coral bleaching which weakens, and if it persists, kills the coral.

[Read more…] about Heat-Resistant Corals

Saildrones For Science

July 11, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/07/EW-07-11-18-Saildrones-for-Science.mp3

Nine years ago, engineer Richard Jenkins broke the world land speed record for a wind-powered vehicle with a sailboat on wheels driving across a dry lakebed at 126 miles per hour.  After years of engineering development, his technology has now taken on the form of a saildrone that can autonomously sail the sea gathering ecologic, oceanic and atmospheric data.

[Read more…] about Saildrones For Science

Polar Bears Are Struggling To Find Food

March 9, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/03/EW-03-09-18-Polar-Bears-Struggling.mp3

Climate change continues to pose a major threat to polar bear survival.  Polar bears, whose native range largely lies within the Arctic Circle, depend on sea ice for nearly all of their life cycle functions.  And rising global temperatures are causing that sea ice to disappear. 

[Read more…] about Polar Bears Are Struggling To Find Food

Is The World’s Largest Sea Turtle No Longer Endangered?

January 29, 2018 By EarthWise 3 Comments

https://earthwiseradio.org/wp-content/uploads/2018/01/EW-01-29-18-Sea-Turtles.mp3

The rapid disappearance of many plants and animals around the world has many scientists saying we are experiencing a sixth mass extinction – the first since the dinosaurs were wiped out some 66 million years ago.  Despite all sorts of conservation efforts, living things are struggling as a result of climate change, habitat loss, and countless other natural and manmade pressures.  Conservation success stories have been few and far between. 

[Read more…] about Is The World’s Largest Sea Turtle No Longer Endangered?

Saving Venice From The Sea

January 26, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/01/EW-01-26-18-Saving-Venice-from-the-Sea.mp3

The risks of rising sea waters are growing more apparent every year.  While the world struggles with taking action to reduce the carbon emissions that are driving the sea level rise, cities around the world are building sea walls designed to protect them from storm surges and flooding.   Most of these are massive, complex infrastructure projects that cost billions of dollars and take decades to complete.

[Read more…] about Saving Venice From The Sea

Strange Ocean Current Behavior

January 18, 2018 By EarthWise 4 Comments

https://earthwiseradio.org/wp-content/uploads/2017/12/EW-01-18-18-Strange-Ocean-Current-Behavior.mp3

The Beaufort Gyre is a massive wind-driven current in the Arctic Ocean.  Located north of Alaska and Canada’s Yukon Territory, it is like a giant spinning top that corrals vast amounts of sea ice in the far north.

[Read more…] about Strange Ocean Current Behavior

North Atlantic Right Whales

January 12, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/12/EW-01-12-18-North-Atlantic-Right-Whales.mp3

North Atlantic right whales are one of the rarest marine mammals in the world.  In fact, according to the National Oceanic and Atmospheric Administration, there are only about 450 of the whales left.  Measuring approximately 50 feet long and weighing close to 100,000 pounds, North Atlantic right whales are now more critically endangered than mountain gorillas, black rhinos, and giant pandas.

[Read more…] about North Atlantic Right Whales

Disappearing Kelp Forests

January 9, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/01/EW-01-09-18-Disappearing-Kelp-Forests.mp3

In recent decades, ocean temperatures in many places have warmed by nearly 3 degrees Fahrenheit.  An effect of this warmer water is the decimation of what were once luxuriant giant kelp forests in eastern Australia and Tasmania.  There used to be thick canopies covering much of the region’s coastal sea surface, but they have wilted in the intolerably warm and nutrient-poor water.

[Read more…] about Disappearing Kelp Forests

A Philippine Coral Reef Survives

January 2, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/12/EW-01-02-18-Philippine-Coral-Reef-Survives.mp3

One of the greatest coral reef ecosystems in the world, the Tubbataha Reef in the Philippines, continues to prosper.  Undersea coral walls that plunge more than 300 feet deep are home to some 600 species of fish and 360 kinds of coral, about half of all known species.  According to experts, the ocean wilderness of Tubbataha Reef is about the closest thing to a true natural state for any reef in the world.

[Read more…] about A Philippine Coral Reef Survives

Floating Cities

January 1, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/12/EW-01-01-18-Floating-Cities.mp3

A familiar theme in science fiction is the idea of floating cities – independent, self-sustaining nation-states at sea where start-up societies work to redesign society and government and don’t have to fight over who owns the land.  The concept even has a name:  seasteading.

[Read more…] about Floating Cities

Is Sustainable Seafood Really Sustainable?

December 5, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/12/EW-12-05-17-Is-Sustainable-Seafood-Sustainable.mp3

Tuna is perhaps the most popular seafood.   We eat it out of a can, we splurge on high-end sushi, and we prepare it in many other ways.   Some species of tuna are over-fished and some fishing methods are unsustainable.   As concerned consumers, we would like to know what sort of tuna we are eating.

[Read more…] about Is Sustainable Seafood Really Sustainable?

Can We Stop A Hurricane?

December 1, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/10/EW-12-01-17-Can-We-Stop-A-Hurricane.mp3

This has been a particularly terrible hurricane season.   Harvey, Irma, Jose, Maria, and Nate all formed in the Atlantic and headed for North America. People in Houston, Florida, all over the Caribbean, and especially Puerto Rico are trying to recover from the effects of these powerful storms.

[Read more…] about Can We Stop A Hurricane?

Corals Like Plastic

November 15, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/10/EW-11-15-17-Corals-Like-Plastic.mp3

Microplastics, which are tiny pieces of weathered plastic less than 5 millimeters in diameter, have been accumulating in the oceans for the past 40 years and are now ubiquitous in the marine environment.  They are a major threat to many kinds of marine life, including numerous species of birds, turtles, fish, marine mammals and invertebrates who ingest the stuff causing a variety of problems.

[Read more…] about Corals Like Plastic

Tsunami And Invasive Species

November 13, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/10/EW-11-13-17-Tsunami-and-Invasive-Species.mp3

According to a new study published in the journal Science, scientists have discovered that hundreds of Japanese marine species have been swept across the Pacific Ocean to the United States following the deadly Tsunami in 2011.        

[Read more…] about Tsunami And Invasive Species

Looking For “Super Coral”

November 2, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/11/EW-11-02-17-Looking-for-Super-Coral.mp3

Coral reefs are essential for much of marine life and are the basis of many commercial fisheries.  In places from Florida to Australia, they are major tourist attractions.  Estimates are that the economic impact of coral reefs is more than $375 billion a year.  And apart from all of that, they are some of the most beautiful places on the planet.

[Read more…] about Looking For “Super Coral”

More Power From The Sea

November 1, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/11/EW-11-01-17-More-Power-from-the-Sea.mp3

The Okinawa Institute of Science and Technology or OIST has been working on ways to generate electricity from the ocean for five years.  Their initial project, known as “Sea Horse” uses submerged turbines anchored to the sea floor that convert the kinetic energy of sustained natural currents into useful electricity, which is then delivered by cables to the land.  The project has been successful and OIST is now planning the next phase.

[Read more…] about More Power From The Sea

Storing Carbon in the Ocean

October 6, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/09/EW-10-06-17-Storing-Carbon-in-the-Ocean.mp3

As carbon dioxide levels in the atmosphere continue to rise, it may be that clean energy technologies, electric cars, and other methods of reducing emissions may not be enough.  Carbon sequestration – sucking carbon out of the atmosphere – is seen by many as a crucial part of the solution.

[Read more…] about Storing Carbon in the Ocean

Climate Change And Hurricanes

October 4, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/10/EW-10-04-17-Climate-Change-and-Hurricanes.mp3

No single weather event can be attributed to climate change.   Storms, floods and droughts have always happened and some of them have always been severe.   However, two centuries of people burning fossil fuels has altered temperatures just enough that some of the storms we have seen in recent times have been much worse than they otherwise would have been.

[Read more…] about Climate Change And Hurricanes

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