Random Nature #220
Shrinking Coastal Seagrass Meadows: Some marine ecologists were recently shocked at the loss of seagrass meadows in many parts of the ocean. I'm shocked--well, disappointed--that a scientific report (with 14 co-authors) which was published in a recent Proceedings of the Natural Academy of Sciences Early Edition contained such basic math errors.
Seagrass meadows, along with coral reefs, mangrove forests, and salt-marshes, provide valuable ecosystem services like nutrient cycling. They also protect edible crustaceans, like shrimps and crabs, and juvenile fish such as salmon. In addition, seagrass meadows provide habitats for endangered species like dugongs, manatees, and sea turtles.
While marine ecologists have been measuring localized seagrass loss for decades, they had never before pooled their information to get a global perspective. So a team led by Michelle Waycott of James Cook University in Townsville, Queensland, Australia pooled data from 215 regional studies, from 1879 to 2006.
They found that the total area of known seagrass meadow had decreased by 29 per cent over the 127 years. They also found that the rate of loss had accelerated, from less than 1 per cent per year in the 1940s to 7 per cent per year since the 1990s.
At 7 percent per year, that's a 44 percent loss from 2000-2006 alone. Yet, the overall loss is 29 percent over 127 years?? If you've had enough math to become a scientist, a basic error like that should jump off the page when you read it. And after reading some of the emotional quotes from the scientists, it's obvious that this was more about activism than science.
Reducing the Flaring at Landfills: Waste Management currently collects some of the methane produced by its Altamont Landfill (near Livermore CA) and burns it for power--about 6.6 MW. But, the landfill is producing more methane than its turbines can burn. Thus, the excess is flared. That will soon change.
Landfill gas is about 50 percent methane and 50 percent carbon dioxide, nitrogen and other particles. Through a series of tubes, the gas is filtered to just methane and cooled down, to the tune of -275 degrees, and it becomes a fuel source, Lewis said.
The plant will produce 13,000 gallons of fuel a day. Three tanks will store 45,000 gallons for the trucks to use. Statewide, the fuel is expected to power hundreds of collection trucks.
There should be sufficient methane production at the landfill for 30 years.
By the by, a bit of climate change math pertaining to this topic...
The carbon dioxide derived from biological decomposition is considered carbon neutral, but the methane is considered to be a man-made greenhouse gas that is more than 20 times more potent to the ozone than carbon dioxide.
But if you just toss those table scraps and lawn clippings into a backyard compost or empty field...
Verification: When city leaders brag about recycling, who actually checks to see that their numbers aren't a bit rosy?
The City of Toronto boasts that its green bin program diverts a third of our garbage and turns it into "black gold" compost. But a Star investigation shows that the program--although nobly conceived--is a sham.
There are two problems. First, the city's claim of how much waste the program diverts from landfill is inflated. Second, some of the compost that is being produced will kill your plants because of its high salt content, according to laboratory tests.
The Star found that, over the past two years, thousands of tons of organics in various stages of the composting process have been dumped into a gravel pit, tossed into landfills or stockpiled on city property. What's more, some of the material residents are told to place in green bins--plastic bags and diapers--has wound up in the belly of a Michigan incinerator, despite Mayor David Miller's vow Toronto will never burn garbage.
Over $15 million a year for organics recycling buys that? Meanwhile, Toronto's civic workers are on strike, which has garbage piling up in the city.
On Thursday, health officials ordered the city to regularly inspect all of the temporary dumpsites for infestations after swarms of maggots were found crawling through the growing piles of garbage, most of which have been steadily increasing since the city workers strike began 13 days ago {June 22}.
...
As city officials closed the temporary dumpsite at Christie Pits this evening, a city-hired contractor blanketed the location with pesticide early this afternoon, just one day after officials obtained a court injunction preventing protesters and picketers from blockading the site.
Christie Pits is a city park with an outdoor hockey rink. Switching links...
Birds have pried many garbage bags open and others were ripped when hit by trucks driven by managers staffing the site, Mr. Burgess said, adding that rain water and leaking garbage have combined into a sludge that has now seeped out onto the cement floor around the rink.
"It’s been long enough that the garbage is starting to liquefy so you can imagine …"
When the strike is finally over, where will that rotting garbage actually end up? And, what about all of the methane that's getting away?
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