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August 2015
August 2015

This is what climate change looks like. In this town of 403 residents 83 miles above the Arctic Circle, beaches are disappearing, ice is melting, temperatures are rising, and the barrier reef Kivalina calls home gets smaller and smaller with every storm.<br />
What is left of former Tropical Stork Erika will being rain across much of Florida over the next few days.
You could become the official face of “asperitas,” the first novel cloud type identified since 1951.
<p></p><p>Greg Colden, a farmer on Hawaii's Big Island, said he is most worried about the damage that more rain and sustained winds could do to the area as Hurricane Ignacio passes by this week.</p><p></p>
At least 2 people have died as the result of storms in the Pacific Northwest.
<p>Tropical Storm Erika plowed through the Caribbean islands, killing more than 20 people so far. Let's look at the latest developments.</p>
Swarms of stinging jellyfish are filling the water of the eastern Mediterranean Sea, but as CNN's Oren Liebermann reports, they are not supposed to be there.
Powerful winds toppled trees and power lines across the Pacific Northwest on Saturday, causing two deaths in the Seattle area and knocking out...
A look at iconic images of devastation caused by Hurricane Katrina on its 10th anniversary.
<p>Ten years after the devastation caused by Hurricane Katrina, NASA has helped scientists better understand why the storm was so devastating, and how to save lives in the future.</p>
Spectacular weather photos from around the world.
While fall-like temperatures surged southward from Canada earlier this week, a changing weather pattern will send in a reinvigorated blast of summer warmth.
Meteorologist Ari Sarsalari explains why Erika was downgraded and what the future holds for the remains of the storm.
Geologists hauling hundreds of pounds of 250-million-year-old rocks from Siberia, through Russian and American customs, say luck was on their side. Not...
In the days after Aug. 29, 2005, when the world watched Hurricane Katrina become one of the worst natural disasters in U.S. history, a question reverberated through the public consciousness: Was climate change to blame? Cars parked on the streets of New Orleans on Aug. 30, 2005, are flooded to the top of the wheel wells. Click image to enlarge. Credit: Marty Bahamonde/FEMA This question arose in part because of a desire after such terrible events to understand why they occur. Katrina killed an estimated 1,200 people and caused more than $100 billion in damage. But the question was also driven by an emerging public awareness of the changes that global warming might mean for the world’s weather, including hurricanes. At the time, scientists had few easy answers. There was clear evidence that temperatures around the globe had risen and expectations that this would shift weather patterns and make some events more extreme in the future, but no clear accounting had been done of whether those effects were discernible in the weather happening to us today. Ten years later, there is still no straightforward answer for this or other storms. Partly this is because the question itself is flawed, belying the complexity of these weather events and their relationship to the climate. But scientists have found other ways to probe the role of warming, by asking, for example, how sea level rise has made flooding worse or how warming has influenced entire hurricane seasons. Such studies can tell us something valuable about how climate change is impacting the world we live in, even if they can’t give us a clear “yes” or “no” answer. The Problem With Hurricanes In 2005, when Katrina helped increase awareness of climate change, the science of what is called “extreme event attribution” was just emerging. Today it is one of the fastest growing fields in climate research, with efforts even to pinpoint the role of warming just days after an event. While scientists can use certain statistical methods to say with a fair degree of confidence what role climate change has played in altering the odds of some types of extreme weather, such as heat waves, they are still hampered when it comes to highly complex phenomena like hurricanes. Unlike temperature records, which tend to extend back long enough to show how the odds of heat waves have changed over time — and whether those changes are beyond the normal chaotic ups and downs of nature — reliable hurricane records extend back at most a few decades to the beginning of satellite observations. That isn’t long enough for scientists to say with confidence that any changes to hurricane frequency or intensity over that time aren’t from natural variability alone. In fact, some work has shown that any expected trends in increased hurricane intensity may not be detectable for several decades. With relatively straightforward events like heat waves, it is also fairly simple to use computer models to compare how often an extreme event occurs with and without anthropogenic warming. But hurricanes are too small-scale and complex for broad climate models to faithfully reproduce, and relatively rare enough that it would take too much computer power and time to complete enough model runs to see any potential changes at this point. “I don’t think it’s yet doable for a hurricane,” Adam Sobel, an atmospheric scientist at Columbia University’s Lamont-Doherty Earth Observatory, said. Finding the Link But there are still ways for scientists to get some idea of the role of warming in hurricane activity and particular storms through other approaches. A 2013 study published in the journal Climatic Change found that Katrina’s impact on the Gulf Coast would have been significantly less damaging under the climate and sea level conditions of 1900 when its storm surge would have been anywhere from 15 to 60 percent lower. While sea level rise from warming played a noticeable role in Katrina, the main issue was another man-made problem: local land subsidence and wetland degradation that have left parts of the coast much more vulnerable to flooding. Any effect of warming on the intensity of the storm was relatively minor, the researchers found. As this study illustrates, sea level rise has so far been the clearest link that can be made between climate change and storms today. Hurricane Katrina shortly after landfall, Aug. 29, 2005, as captured by NOAA's GOES-12 weather satellite. Click image to enlarge. Credit: NOAA Another modeling study in the Journal of Geophysical Research: Atmospheres, conducted just a year after the storm, found that warmer ocean temperatures in Katrina’s path would help boost the intensity of the storm by changing the amount of water vapor in the atmosphere. That finding is broadly in line with what is expected from climate change, Gabriel Vecchi, a climate scientist at the National Oceanic and Atmospheric Administration who was not involved with the work, said. But in the years since, researchers have noticed that the exact patterns of ocean warming can create differences in how hurricanes in different regions might respond to climate change, so studies like this don’t necessarily give the whole picture. Another avenue researchers have recently pursued is to broaden their view and look at how warming may have impacted an entire hurricane season or particular hurricane trends. A study to be published in the Bulletin of the American Meteorological Society in September has found that manmade warming upped the odds of the uptick in hurricane activity around Hawaii in 2014, for example. And while the record is too short for any role of warming to be clear yet for trends in hurricane intensity or frequency overall, some particular trends could lend themselves toward detecting and attributing a warming influence. Tom Knutson, one of Vecchi’s NOAA colleagues and frequent collaborators, cited the recent finding that warming could shift hurricane tracks poleward, as one possibility. Another candidate could be any increase in hurricane rainfall which hasn’t shown up yet in observations, but is a robust projection in climate models, he said. The bottom line a decade out from the devastation of Katrina is that while questions on the impacts of climate change in today’s world don’t always have easy answers, it doesn’t mean researchers can’t say anything at all.
The risk of major blazes could increase 600 percent by mid-century, say scientists.
CNN's Hala Gorani speaks to NASA climate scientist Josh Willis about the significance of the melting of Greenland's rapidly melting ice sheets.
Scientists are baffled as to what may be causing a high volume of whale deaths in the Gulf of Alaska this summer. From May 2015 to mid-August, 30 large...
Residents were assessing the damage on Tuesday, after a small tornado tore through the town of Dubbo in the Australian state of New South Wales on Monday, bringing down power lines and trees, reported local media. (Aug. 25)
The latest data on sea level rise from global warming suggests that three feet (one meter) or more is unavoidable in the next 100-200 years, NASA scientists said Wednesday.
<p>Two mysterious red hazes hovered over Earth on August 10. Astronauts onboard the International Space Station snapped a picture of the first one as it passed over the Midwest--either Illinois or Missouri. And yesterday NASA's Earth Observatory announced that a second one was spotted just minutes later over Mexico.</p>
In honor of the agency’s 99th birthday, the National Park Service is offering free entrance to its 58 parks and 350 other sites. In the Pacific Northwest and Northern Rockies, park visitors might also be hoping that entry comes with a free respirator and x-ray vision. 
Strange blue lights glowing on the edge of space first appeared over polar regions in 1885 and today, sightings are becoming increasingly common, and now the phenomenon is moving into lower latitudes including Northern California. Like the proverbial canary in the coal mine, these glowing space clouds may be a celestial siren, warning of Earth's global warming, according to some scientists.
It's not what Bostonians want to hear: The Farmer's Almanac says another rough winter is in your stars.
Dozens of wildfires raging across the northwestern United States have spread a vail of smoke over the region, blocking the sun and causing health issues.
A beautiful sight appeared in Tucson, Arizona after a recent storm, a spectacular double rainbow.
There’s a drought in California. Perhaps you’ve heard a few things about it. Like the fact that it’s cost the state $2.7 billion in losses, helped burn up roughly 118,000 acres of forest this year to date and inspired Los Angeles to release a 96 million-strong armada of shade balls into reservoirs (though it was apparently a PR stunt). 
<p>With an El Nino growing in the Pacific Ocean and climate change spurring global temperatures ever higher, almost nothing can stop Earth from breaking 2014’s mark for the warmest year on record.</p>
Surveillance of straight line winds destroying a parking structure in Amarillo, TX.
The West Antarctic is one of the most remote places on the planet, but its fate is intimately tied with hundreds of millions living along the world’s coastlines. 
Meteorologist Ari Sarsalari talks about the most vital things you should keep in mind if a hurricane is making its way toward land and the most dangerous aspects of storms.
Visualization and prediction tools have made significant strides in the 10 years since Hurricane Katrina made landfall.
<p>As Hurricane Katrina barreled towards the Gulf Coast, peaking at Category 5 strength while feasting on the warm waters of the Gulf of Mexico, meteorologists around the country prepared to deliver one of the most crucial and life-saving forecasts in history.</p>
<p>California’s drought was spawned by natural weather variations that have bedeviled the West throughout recorded history. But a new study released Thursday says human-caused global warming is worsening the natural phenomenon. The study by Columbia University’s Earth Institute isn’t the first to say warming has played a key role in fueling California’s dry conditions, but it’s the first to measure its impact, predicting that it increased the problem by as much as 25 percent.</p>
Video from Atlanta's Hartsfield/Jackson International Airport appears to show a bolt of lightning striking a Delta Jet.
<p>Earth just keeps getting hotter. July was the planet's warmest month on record, smashing old marks, U.S. weather officials said.</p>
As hurricane season is in full swing, here's a look at the storms and their impact.
Cuba put its civil defense system on alert due to a year-long drought that is forecast to worsen in the coming months and has already damaged agriculture and left more than a million people relying on trucked-in water.
<p>Smoke from the wildfires blazing in the western United States covers much of northern California and Washington state in new images taken from space.</p>
The carcasses of salmon, trout and more than a dozen other newly extinct native species lie in dry streambeds around California. Exhausted firefighters in the Sierra Nevada battle some of the biggest wildfires they've ever seen. And in Central Valley farm towns, more and more mothers hear the squeal of empty pipes when they turn on water taps to cook dinner.
Record high temperatures are happening more frequently across the globe.
<p>Goni and Astani sure do make a beautiful couple, though not one we’d wish to cross paths with anytime soon. Satellites and astronauts are keeping a close eye on the pair of typhoons as they brew over the Western Pacific.</p>
Aug 20, 2015; 7:51 AM ET A possible tornado was spotted near Crest Hill, Illinois, on Tuesday, August 18, while large parts of the Chicago area were under tornado warnings.
Google says data has been wiped from discs at one of its data centres in Belgium - after the local power grid was struck by lightning four times.
A rare "fire rainbow" appeared in the sky over South Carolina on Sunday evening. Folks on social media eagerly shared images of the fire rainbow, which appeared in wispy clouds over Isle of Palms, S.C.
Here we go again. The infamous Mars Hoax that has circulated widely through the Internet since its first appearance in 2003, when it originated in the form of an email message titled "Mars Spectacular," has reared its ugly head yet again.
An astronaut took a beautiful photo of Earth at night, below, while flying over Central America in the International Space Station. The moon is in the upper left, and a massive thunderstorm off to the right. But there's something weird...
A fire whirl developed near Boise, Idaho, and could potentially cause large-scale damage in the region. CNN's Pedram Javaheri has more.
On Aug. 5, 2015, the color of the Animas River in Colorado turned a rusty orange as millions of gallons of contaminated water flowed downstream.
The lobster population has crashed to the lowest levels on record in southern New England while climbing to heights never before seen in the cold waters off Maine and other northern reaches — a geographic shift that scientists attribute in large part to the warming of the ocean.
Chris Warren and Jim Cantore talk about how heat affects your body.
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