Showing posts with label water. Show all posts
Showing posts with label water. Show all posts

December 07, 2012

Light from a water bottle could brighten millions of poor homes

http://phys.org/news/2011-09-bottle-brighten-millions-poor-homes.html


September 16, 2011 by Lisa Zyga 






As simple as it sounds, a one-liter plastic bottle filled with purified water and some bleach could serve as a light bulb for some of the millions of people who live without electricity. Originally developed by MIT students, the "solar bottle bulb" is now being distributed by the MyShelter Foundation to homes throughout the Philippines. The foundation’s goal is to use this alternative source of daylight to brighten one million homes in the country by 2012. 

In order to make the water bottles "light up," holes are cut in the metal roofs of homes and a bottle is placed and sealed into each hole so that its lower half emerges from the ceiling. The clear water disperses the light in all directions through refraction, which can provide a luminosity that is equivalent to a 55-watt electric light bulb, according to the MyShelter Foundation. The bleach prevents mold growth so that the bulbs can last for up to five years. 

Although the solar bottle bulb only works during the day, it can meet the needs of many of the people in Manila, Philippines, and other cities, where the homes are so close together that very little sunlight can enter through the windows. As a result, the homes are dark even during the day. 

The solar bottle bulbs’ advantages include sustainability and safety; compared with candles or faulty electrical connections, they aren’t a fire hazard. The bulbs are also inexpensive to make and install, and of course have no operating costs while in use. 

The MyShelter Foundation is promoting the solar bottle bulbs as the Isang Litrong Liwanag ("A Liter of Light") project. In Manila, the city government paid for the bulbs while the foundation is training residents on how to make and install them.

November 27, 2012

Urban Trees: Let’s Grow Old Together

http://americancity.org/daily/entry/urban-trees-lets-grow-old-together


Dublin, Ohio | 10/10/2012 7:00am | 0

These large trees in downtown Charlotte, N.C. each received enough soil to last a lifetime. Credit:Willamor Media
When we talk about street trees and the urban forest, sometimes we miss an essential truth: Not all street trees are created equal. Mature trees are an order of magnitude more valuable to us than young, small ones.
There is no shortage of scientific evidence supporting the incredible benefits that mature trees provide to urban neighborhoods. Yet many local policies seem to focus only on the quantity of trees being planted rather than the quality. Let’s look at some of the ways mature urban trees provide incredible benefits to their communities.

September 05, 2012

Is Junk Food Really Cheaper?


By 



THE “fact” that junk food is cheaper than real food has become a reflexive part of how we explain why so many Americans are overweight, particularly those with lower incomes. I frequently read confident statements like, “when a bag of chips is cheaper than a head of broccoli ...” or “it’s more affordable to feed a family of four at McDonald’s than to cook a healthy meal for them at home.”
Daniel Borris for The New York Times

This is just plain wrong. In fact it isn’t cheaper to eat highly processed food: a typical order for a family of four — for example, two Big Macs, a cheeseburger, six chicken McNuggets, two medium and two small fries, and two medium and two small sodas — costs, at the McDonald’s a hundred steps from where I write, about $28. (Judicious ordering of “Happy Meals” can reduce that to about $23 — and you get a few apple slices in addition to the fries!)
In general, despite extensive government subsidies, hyperprocessed food remains more expensive than food cooked at home. You can serve a roasted chicken with vegetables along with a simple salad and milk for about $14, and feed four or even six people. If that’s too much money, substitute a meal of rice and canned beans with bacon, green peppers and onions; it’s easily enough for four people and costs about $9. (Omitting the bacon, using dried beans, which are also lower in sodium, or substituting carrots for the peppers reduces the price further, of course.)
Another argument runs that junk food is cheaper when measured by the calorie, and that this makes fast food essential for the poor because they need cheap calories. But given that half of the people in this country (and a higher percentage of poor people) consume too many calories rather than too few, measuring food’s value by the calorie makes as much sense as measuring a drink’s value by its alcohol content. (Why not drink 95 percent neutral grain spirit, the cheapest way to get drunk?)
Besides, that argument, even if we all needed to gain weight, is not always true. A meal of real food cooked at home can easily contain more calories, most of them of the “healthy” variety. (Olive oil accounts for many of the calories in the roast chicken meal, for example.)In comparing prices of real food and junk food, I used supermarket ingredients, not the pricier organic or local food that many people would consider ideal. But food choices are not black and white; the alternative to fast food is not necessarily organic food, any more than the alternative to soda is Bordeaux.
The alternative to soda is water, and the alternative to junk food is not grass-fed beef and greens from a trendy farmers’ market, but anything other than junk food: rice, grains, pasta, beans, fresh vegetables, canned vegetables, frozen vegetables, meat, fish, poultry, dairy products, bread, peanut butter, a thousand other things cooked at home — in almost every case a far superior alternative.
“Anything that you do that’s not fast food is terrific; cooking once a week is far better than not cooking at all,” says Marion Nestle, professor of food studies at New York University and author of “What to Eat.” “It’s the same argument as exercise: more is better than less and some is a lot better than none.”
THE fact is that most people can afford real food. Even the nearly 50 million Americans who are enrolled in the Supplemental Nutrition Assistance Program (formerly known as food stamps) receive about $5 per person per day, which is far from ideal but enough to survive. So we have to assume that money alone doesn’t guide decisions about what to eat. There are, of course, the so-called food deserts, places where it’s hard to find food: the Department of Agriculture says that more than two million Americans in low-income rural areas live 10 miles or more from a supermarket, and more than five million households without access to cars live more than a half mile from a supermarket.
Still, 93 percent of those with limited access to supermarkets do have access to vehicles, though it takes them 20 more minutes to travel to the store than the national average. And after a long day of work at one or even two jobs, 20 extra minutes — plus cooking time — must seem like an eternity.
Taking the long route to putting food on the table may not be easy, but for almost all Americans it remains a choice, and if you can drive to McDonald’s you can drive to Safeway. It’s cooking that’s the real challenge. (The real challenge is not “I’m too busy to cook.” In 2010 the average American, regardless of weekly earnings, watched no less than an hour and a half of television per day. The time is there.)
The core problem is that cooking is defined as work, and fast food is both a pleasure and a crutch. “People really are stressed out with all that they have to do, and they don’t want to cook,” says Julie Guthman, associate professor of community studies at the University of California, Santa Cruz, and author of the forthcoming “Weighing In: Obesity, Food Justice and the Limits of Capitalism.” “Their reaction is, ‘Let me enjoy what I want to eat, and stop telling me what to do.’ And it’s one of the few things that less well-off people have: they don’t have to cook.”
It’s not just about choice, however, and rational arguments go only so far, because money and access and time and skill are not the only considerations. The ubiquity, convenience and habit-forming appeal of hyperprocessed foods have largely drowned out the alternatives: there are five fast-food restaurants for every supermarket in the United States; in recent decades the adjusted for inflation price of fresh produce has increased by 40 percent while the price of soda and processed food has decreased by as much as 30 percent; and nearly inconceivable resources go into encouraging consumption in restaurants: fast-food companies spent $4.2 billion on marketing in 2009.
Furthermore, the engineering behind hyperprocessed food makes it virtually addictive. A 2009 study by the Scripps Research Institute indicates that overconsumption of fast food “triggers addiction-like neuroaddictive responses” in the brain, making it harder to trigger the release of dopamine. In other words the more fast food we eat, the more we need to give us pleasure; thus the report suggests that the same mechanisms underlie drug addiction and obesity.
This addiction to processed food is the result of decades of vision and hard work by the industry. For 50 years, says David A. Kessler, former commissioner of the Food and Drug Administration and author of “The End of Overeating,” companies strove to create food that was “energy-dense, highly stimulating, and went down easy. They put it on every street corner and made it mobile, and they made it socially acceptable to eat anytime and anyplace. They created a food carnival, and that’s where we live. And if you’re used to self-stimulation every 15 minutes, well, you can’t run into the kitchen to satisfy that urge.”
Real cultural changes are needed to turn this around. Somehow, no-nonsense cooking and eating — roasting a chicken, making a grilled cheese sandwich, scrambling an egg, tossing a salad — must become popular again, and valued not just by hipsters in Brooklyn or locavores in Berkeley. The smart campaign is not to get McDonald’s to serve better food but to get people to see cooking as a joy rather than a burden, or at least as part of a normal life.
As with any addictive behavior, this one is most easily countered by educating children about the better way. Children, after all, are born without bad habits. And yet it’s adults who must begin to tear down the food carnival.
The question is how? Efforts are everywhere. The People’s Grocery in Oakland secures affordable groceries for low-income people. Zoning laws in Los Angeles restrict the number of fast-food restaurants in high-obesity neighborhoods. There’s the Healthy Food Financing Initiative, a successful Pennsylvania program to build fresh food outlets in underserved areas, now being expanded nationally. FoodCorps and Cooking Matters teach young people how to farm and cook.
As Malik Yakini, executive director of the Detroit Black Community Food Security Network, says, “We’ve seen minor successes, but the food movement is still at the infant stage, and we need a massive social shift to convince people to consider healthier options.”
HOW do you change a culture? The answers, not surprisingly, are complex. “Once I look at what I’m eating,” says Dr. Kessler, “and realize it’s not food, and I ask ‘what am I doing here?’ that’s the start. It’s not about whether I think it’s good for me, it’s about changing how I feel. And we change how people feel by changing the environment.”
Obviously, in an atmosphere where any regulation is immediately labeled “nanny statism,” changing “the environment” is difficult. But we’ve done this before, with tobacco. The 1998 tobacco settlement limited cigarette marketing and forced manufacturers to finance anti-smoking campaigns — a negotiated change that led to an environmental one that in turn led to a cultural one, after which kids said to their parents, “I wish you didn’t smoke.” Smoking had to be converted from a cool habit into one practiced by pariahs.
A similar victory in the food world is symbolized by the stories parents tell me of their kids booing as they drive by McDonald’s.
To make changes like this more widespread we need action both cultural and political. The cultural lies in celebrating real food; raising our children in homes that don’t program them for fast-produced, eaten-on-the-run, high-calorie, low-nutrition junk; giving them the gift of appreciating the pleasures of nourishing one another and enjoying that nourishment together.
Political action would mean agitating to limit the marketing of junk; forcing its makers to pay the true costs of production; recognizing that advertising for fast food is not the exercise of free speech but behavior manipulation of addictive substances; and making certain that real food is affordable and available to everyone. The political challenge is the more difficult one, but it cannot be ignored.
What’s easier is to cook at every opportunity, to demonstrate to family and neighbors that the real way is the better way. And even the more fun way: kind of like a carnival
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Oregon project could turn wave energy into electricity




A computer-equipped buoy that aims to turn wave energy into usable electricity output is assembled at a Vancouver, Wash. plant. The buoy, one of several of myriad designs, will be released into the Pacific Ocean near Portland, Ore.
THOMAS PATTERSON, via NEW YORK TIMES

http://www.heraldtribune.com/article/20120905/WIRE/120909820/-1/news?p=1&tc=pgPosted by Katy

About a dozen buoys have been placed a few miles from the cost of Oregon to get energy from the waves/currents in the ocean for usable electricity. related website: http://www.oregonwave.org/

Published: Wednesday, September 5, 2012 at 9:47 a.m.
Last Modified: Wednesday, September 5, 2012 at 9:47 a.m.
PORTLAND, Ore. - About 15 years ago, this environmentally conscious state with a fir tree on its license plates began pushing the idea of making renewable energy from the ocean waves that bob and swell on the Pacific horizon.
Then one of the first test-buoy generators, launched with great fanfare, promptly sank.
It was not a good start.
But time and technology turned the page, and now the first commercially licensed grid-connected wave-energy device in the nation, designed by a New Jersey company, Ocean Power Technologies, is in its final weeks of testing before a planned launch in October. The federal permit for up to 10 generators came last month, enough, the company says, to power about 1,000 homes. When engineers are satisfied that everything is ready, a barge will carry the 260-ton pioneer to its anchoring spot about two and a half miles offshore near the city of Reedsport, on the central coast.
"All eyes are on the OPT buoy," said Jason Busch, the executive director of the Oregon Wave Energy Trust, a nonprofit state-financed group that has spent $10 million in the last six years on scientific wave-energy research and grants, including more than $430,000 to Ocean Power Technologies alone. Making lots of electricity on the buoy and getting it to shore to turn on lights would be great, Busch said. Riding out the storm-tossed seas through winter? Priceless.
''It has to survive," he said.
Adding to the breath-holding nature of the moment, energy experts and state officials said, is that Oregon is also in the final stages of a long-term coastal mapping and planning project that is aiming to produce, by late this year or early next, a blueprint for where wave energy could be encouraged or discouraged based on potential conflicts with fishing, crabbing and other marine uses.
The project's leader, Paul Klarin, said wave technology is so new, compared to, say, wind energy, that the designs are like a curiosity shop — all over the place in creative thinking about how to get the energy contained in a wave into a wire in a way that is cost-effective and efficient.
''Some are on the seabed on the ocean floor, some are in the water column, some are sitting on the surface, some project up from the surface into the atmosphere, like wind — many different sizes, many different forms, many different footprints," said Klarin, the marine program coordinator at the Oregon Department of Land Conservation and Development. "There's no one-size-fits-all kind of plan."
Energy development groups around the world are closely watching what happens here, because success or failure with the first United States commercial license could affect the flow of private investment by bigger companies that have mostly stayed on the shore while smaller entrepreneurs struggled in the surf. Ocean Power Technologies also will be seeking money to build more generators.
''Wave energy is very expensive to develop, and they need to see that there is a potential worldwide," said Antonio Sarmento, a professor at Lisbon Technical University and the director of the Wave Energy Centre, a private nonprofit group based in Portugal. "In that sense, having the first commercial deployment in the U.S. is very, very positive."
Here in Oregon, the momentum of research appears to be increasing. Last month, the Northwest National Marine Renewable Energy Center — financed by the United States Department of Energy in collaboration with Oregon State University and the University of Washington — deployed one of the first public wave energy testing systems in the nation, called Ocean Sentinel, about two and a half hours from Portland, in Newport. The first device tested was a half-scale prototype from a New Zealand company.
Fishing industry lobbyists and lawyers worry that a surge of wave energy could repeat what happened when hydroelectricity came to the Pacific Northwest in a big way starting in the 1930s. Builders then did not think through the dense ecological web that nature had devised around the tens of millions of salmon — suddenly blocked from their inland spawning routes — that had over millenniums become a cornerstone species for everything from bears to birds.
"Our greatest concern is that they don't do what they did with dams — put a lot of them in the ocean and then just stand back and see what happens," said John Holloway, the secretary of Oregon Anglers, a political action committee for recreational fishing. "We're advocating a go-slow approach."
What has not changed is that the Pacific Northwest still has a siren song for wave-energy dreamers in the big, consistent rolling ocean swells that define offshore waters — and make many a boater seasick — from Northern California through Washington state.
''Wave energy is essentially an accumulation of wind energy," Charles F. Dunleavy, the chief executive at Ocean Power Technologies, said in a telephone interview. In the northern Pacific, he said, consistent winds fuel consistent waves, and the distance they travel in their rolling line creates a huge area of wave energy, or fetch, that a bobbing buoy can capture. Other places with good fetch include some areas off the coasts of Western Europe and South America.
But the project also hinges on squeezing out the tiniest of incremental efficiencies in tapping the waves as they come. On the Ocean Power Technologies buoy, which looks like a giant cannon stuffed with electronics, company engineers pursued an insight that sailors have known in their sea legs since the days of Odysseus: Every wave is different.
The onboard computer in each buoy, in communication with an array of small devices called wave riders that float farther out in the ocean, adapts, or "tunes," to each incoming wave, adjusting the way the giant internal shaft rides up and down as the swell passes through. The up-and-down motion of the shaft creates the electricity, which goes to shore through a seabed cable.
In a nod to environmental concerns, the buoy was redesigned to remove all hydraulic fluids, which some critics feared could contaminate the water in the event of an accident; rack-and-pinion gears now drive the mechanics.
The three anchoring tethers, said Michael G. Kelly, the vice president of operations at Ocean Power Technologies, were also built to withstand a 100-year storm, but also with enough redundancies that even if two anchors failed the third would be enough to keep the buoy in place.