|OK In Health - Science Corner|
Map App Helps Bring Nature into the Equation - August 2012
Beat the heat and keep your community cool by investing in nature
Imagine a sleek contraption for your backyard so powerful it has the cooling effect of 10 air conditioners, quietly filters dust, allergens, and pollutants, runs for free on solar power, and its only byproduct is oxygen.
Dream no longer. This elegant machine is a healthy, mature tree.
Using energy from sunlight, a tree can soak up almost 400 litres of water from the ground each day, and cool the surrounding air through transpiration. Trees absorb airborne contaminants and breathe out clean oxygen. They’re such efficient air filters that Columbia University researchers estimate that for every 343 trees added to a square kilometre asthma rates in young people drop by about 25 per cent.
What else can these handy natural contraptions do for us? The U.S. Forest Service says trees near buildings reduce air-conditioning needs by a third and, because they break the wind, save up to half the energy used for heating. According to the University of Washington’s Center for Urban Horticulture, mature tree canopies reduce the air temperature of urban areas between five and 10 degrees Celsius.
Imagine replacing these ecological services with human-built substitutes. While we can handle cooling a building, creating city-sized air conditioning that could reduce the temperature of an urban area by 10 degrees is an engineering feat that would require massive amounts of energy.
The sophisticated services that nature provides are not only misunderstood and underappreciated; they tend to be ignored in modern economics and urban planning. When a forest or wetland is converted to another use, municipal decision-makers focus on infrastructure costs, property values, and future contributions to the tax roll.
We continue to deplete natural resources and degrade nature in and around urban areas, failing to recognize the contribution of ecosystem services – like clean air, fresh water, and cooling – to the economy and health of communities. As The Economics of Ecosystems and Biodiversity initiative notes, this ecological damage is the “perfect crime”, a theft barely noticed. We wouldn’t let a bank get away with losing our life savings. We shouldn’t let decision-makers off the hook when they allow our natural wealth to be squandered.
Encouragingly, a growing chorus of economists and policy-makers has begun advocating for a smarter way of accounting for the true value of nature – something called natural capital economics.
Most people understand the concept of financial capital. We pay for things we find valuable. Natural capital extends that perspective to ecological goods and services. It would be expensive to develop and build facilities to replace the things nature does. So we calculate the dollar value we would have to pay if we had to provide them ourselves.
How much is our natural capital worth? According to the David Suzuki Foundation’s research, the 7,000-square-kilometre Ontario Greenbelt provides at least $2.6 billion in non-market benefits each year. British Columbia’s Lower Mainland region is estimated to be worth at least $5.4 billion annually. Global studies have estimated the total value of the world’s ecosystem goods and services to be on par with the value of the entire global economy. In short, our natural capital is a source of staggering wealth.
Why do we continue to fritter away these amazing assets, despite their immense value? Unfortunately most people don’t have a clear picture of what stocks of natural capital exist in their communities, let alone the true cost of converting natural areas for industrial, commercial, or residential development.
That’s why the David Suzuki Foundation and Google Earth Outreach recently launched an online map that will allow residents and decision-makers to zoom in to their community and calculate the economic value of natural capital assets. The interactive Putting Natural Capital on the Map application allows users to select a parcel of land and find out what types of natural ecosystems it contains and what economic benefits it provides.
While economists, ecologists, and decision-makers grapple with how to estimate an appropriate economic value for nature’s benefits, I am hopeful that the field will spur communities to consider the true value of their natural riches. In the meantime, I encourage you to beat the heat and keep your community cool by investing in your own bit of natural capital – a tree for your yard or park.
Written with contributions from David Suzuki Foundation Communications Specialist Jode Roberts.
David's Bio: Dr. David Suzuki is a scientist, broadcaster, author, and chair of the David Suzuki Foundation.
He is Companion to the Order of Canada and a recipient of UNESCO's Kalinga Prize for science, the United Nations Environment Program medal, the 2009 Right Livelihood Award, and Global 500. Dr. Suzuki is Professor Emeritus at the University of British Columbia in Vancouver and holds 24 honorary degrees from universities around the world. He is familiar to television audiences as host of the long-running CBC television program The Nature of Things, and to radio audiences as the original host of CBC Radio's Quirks and Quarks, as well as the acclaimed series It's a Matter of Survival and From Naked Ape to Superspecies. His written work includes more than 47 books. Dr. Suzuki lives with his wife, Dr. Tara Cullis, and family in Vancouver, B.C. - David Suzuki Website
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Description: Nori has been valued as a food of longevity by Japanese people for a long time. According to the earliest written records in 701 AD, nori was so valuable as to be one of the tributes in those days.
The amount of nutrition contained in nori is the highest among seaweeds, and nori contains as much protein as soybeans. Nori also contains vitamins and minerals such as iron and calcium as well as EPA (Eicosapentaenoic Acid) and fiber, which are necessary for maintaining good health.
Nori is full of three desirable taste components: glutamate acid, inosinic acid, and guanil acid--also called "the flavor of Japan." This is the secret of its popularity among Japanese people since ancient times.
Nori contains 12 kinds of vitamins including group A and B vitamins. Nori is called "The Reservoir of Vitamins" because few other foods are as much in vitamins as nori. Nori is part of a "beauty diet"--rich in protein and low in cholesterol.
It is also part of a "healthy diet"--abundant in vitamins and minerals. It is especially good for growing children, with excellent medical value because it contains a substance that lowers cholesterol, helping to prevent arteriosclerosis.
At the Japan Cancer Congress in 1958, professor Ichiro Yamamoto from Kitazato University announced that nori has cancer-preventing properties, and since then, nori's medical value has gained a significant amount of public attention.