Canada becomes first G7 country to ban shark fin imports

The Guardian

Shark fins for sale in Canada.
Photo by Hakai MAGAZINE 

• Measure which also bans sale of fins awaits royal assent. Story here.

"Artifishal." The fight to save wild salmon. (Video)

Deadly gas: Cutting farm emissions in half could save 3,000 lives a year

Bureau of Investigative Journalism

Spreading manure on a harvested corn field.
Photo by Chesapeake Bay Program.

Thousands of deaths could be avoided each year if air pollution from UK farms were halved, new analysis has revealed. But the government's failure to act means the most damaging sectors are under no obligation to cut their emissions. Story here.

More research on African swine fever is urgently needed: No cure, no vaccine and no treatment yet exists for this lethal pig disease

ILRI

The swelling around the kidneys & the muscle hemorrhages shown here
are typical of pigs with African swine fever. Karen Apicelli - USDA.

African swine fever is a highly contagious viral disease affecting domestic and wild pigs. It kills nearly 100% of the pigs it infects. The good news is that the African swine fever virus does not infect or harm humans. The bad news is that it devastates household and national economies. Particularly in Africa and now in China and Vietnam, it can destroy the livelihoods. More here.

An Alberta wildfire specialist links Fort Mac "megafire" and BC's 2017 fire season to climate change

The Energy Mix

On May, 2016, the Landsat 7 satellite (NASA) acquired this
false-colour image of the wildfire that burned through
Fort McMurray. Advanced technology allows it to
penetrate clouds and smoke to reveal the hot spots
associated with active fires. Smoke appears white
& burned areas appear brown.

More than two thousand wildfires hit British Columbia in 2017. Another massive one consumed much of Fort McMurray, Alberta a year earlier. Mike Flannigan, A University specialist in wildland fire, says both were connected to climate change. Story here.

Remote lakes in New Brunswick, Canada, remain dangerously polluted, half-a-century after being drenched with the insecticide, DDT, says study.

It's no secret that the now-infamous bug-killer, DDT,

persists stubbornly in the environment. Still, what scientists found in lake sediments they recently analyzed in the Atlantic province, 50 years after it was last used there, shocked them. The sediment in all five lakes they tested (representing numerous watersheds), were laced with DDT at levels up to 450 times beyond what would be considered safe for key aquatic species and even entire food webs.

by Larry Powell

A plane sprays DDT on bud worms in Oregon, 1955. 

Photo by Forest Health Protection.

In some ways, it was like a real war.

In the early fifties, governments and the forest industry teamed up in New Brunswick to launch a massive aerial assault against spruce bud worms. 

The pests had probably been eating their way through conifer stands in eastern Canada and the U.S. for thousands of years. But now, they were causing hundreds of millions of dollars of damage yearly to forests of mostly spruce and fir, highly valued by a growing human population.

By 1968, almost six million kilograms of DDT had been unleashed on the worms. The area treated, varied widely from year to year - from about 80 thousand hectares to two million. Some years, the same area was treated once - others, twice.

 “Budworm City,” established in the early 1950s and used 

as a base for DDT spray operations in northern 

New Brunswick. Photo credit: D.C. Anderson.

Then, some two years later, as awareness of the harm the product was doing to fish and wildlife grew, authorities stopped using it altogether. 

But not before copious amounts had washed off the land and settled into the water directly from the air. 

But this latest research builds even further on what was known back then. 

In the words of the researchers, "Surprisingly, DDT and its toxic breakdown products are still very high in modern sediments - above levels where harmful biological effects tend to occur." 

Populations of a small water flea, Daphnia sp. (below) were found to have gone down significantly in the lakes tested. While such a creature may not sound impressive, it's considered an important invertebrate in the food webs of lakes.

An image of the aquatic organism Daphnia, commonly known as a water flea. They are often numerous in lakes and important grazers of algae, and are eaten by small fish, waterfowl, and large invertebrates. Daphnia are sensitive to their aquatic environment, including DDT levels and other contaminants. Daphniids are used worldwide in toxicology and ecology studies, and are often considered a keystone aquatic species. The postabdominal claw (indicated by the arrow) of Daphnia are preserved in lake sediments and useful to their identification. Photo credit: Kim Lemmen (Queen's University).

L. to r. Environmental Scientist and lead author Dr Josh Kurek,

study co-author Sarah Veinot, field assistant Marley Caddell, and study 

co-author Paul MacKeigan at a remote New Brunswick lake.

The study's lead author, Dr. Joshua Kurek, tells PinP, "Just to be clear, the loss/reduction of Daphnia is a concern, as Daphnia eat algae and are also food for fish. Fewer Daphnia mean less food for fish (and other organisms). It also means less grazing pressure on algae. It's very difficult to quantify. But other studies do show more algae (and blooms of algae), when Daphnia are fewer in lakes."

Excessive growth of sometimes toxic algae can clog lakes, robbing them of their oxygen and killing fish. It has become a huge problem in waterways, worldwide. 

Because New Brunswick had likely become the most heavily-sprayed forested region on the continent, DDT's harmful legacy could well be playing out well beyond the five lakes that were studied. (There are about 2,500 in the province, in all.) 

Another co-author, Dr. Karen Kidd of McMaster University, adds a cautionary note of her own. "The lesson from our study is that pesticide use can result in persistent and permanent changes in aquatic environments."

The project was conducted by experts from three Canadian Universities; Mount Allison, New Brunswick and McMaster. Its findings were published today in the journal,Environmental Science & Technology.

DDT's "rap sheet" is a long one.

                        

Rachel Carson's famous book, "Silent Spring," published in the early 60s, dedicates almost an entire chapter to the New Brunswick experience. Called "Rivers of Death," it documents the loss of countless fish, insects and birds along the Mirimachi River, one of North America's best salmon-fishing spots, in the wake of the spraying. She noted the pilots made no effort to avoid spraying directly over waterways. She also observed that the spraying was having questionable results, in any event, since the amounts applied kept having to be increased, just to keep ahead of the hungry worms.

Also, years ago, DDT was found to cause a thinning of the eggshells of dozens of bird species, leading to reproductive failure. While their numbers have since recovered, raptors, notably the bald eagle, were especially hard hit.

A swift, as depicted in
Bird Craft - 1897.

And, by killing the bugs eaten by insectivorous birds such as the swift (above), DDT has long been recognized as instrumental in widespread species declines, as well. 

RELATED: 

1. Read another version here.
2. New Studies Show Farm Chemicals Are Affecting More Than Bees. Bird Populations are Declining, Too. Is modern agriculture's hold on nature becoming a death grip?
3. Research Suggests Our Past, Prolific Use of the Insecticide DDT May Still Be Contributing To A Scourge Of Modern-Day Diseases Related To Obesity.

Plant Species Have Been Disappearing 500 Times Faster Than Normal, Thanks to Humans

Smithsonian.com

Omar Monsgur exhibits endangered plants in Puerto Rico.
US Fish & Wildlife photo.

Researchers call the results “frightening” because it’s likely “gross underestimate” and the problem is probably much worse. Story here.

Older forests resist change, climate change, that is

Science News

A  forest in Maritime Canada. A PinP photo.

With age, forests in eastern US and Canada become less vulnerable to climate change, study finds. Story here.

'Existential' Risk of Climate Crisis Could Lead to Civilizational Collapse by 2050, Warns Report

Common Dreams

Drivers near Ponoka, Alberta face smoke from wildfires burning further north.
2019 photo by TaqaSanPedroAko.

"The world is currently completely unprepared to envisage, and even less deal with, the consequences of catastrophic climate change." More here.

Loss of Canadian Arctic sea ice stokes summer heat waves in southern U.S.

PHYS ORG

Drift ice in the Arctic ocean. Wickimedia commons.

Over the last 40 years, Arctic sea ice thickness, extent and volume have declined dramatically. Now, a new study finds a link between declining sea ice coverage in parts of the Canadian Arctic and an increasing incidence of summer heat waves across the southern United States. Story here.

Downpours of torrential rain more frequent with global warming

PHYS ORG

Flooding in Saskatchewan. A PinP photo.

The frequency of downpours of heavy rain—which can lead to flash floods, devastation, and outbreaks of waterborne disease—has increased across the globe in the past 50 years, research led by the University of Saskatchewan (USask) has found. Story here.