Green Options » hydroelectricity

Mekong River Dams Ruin Livelihoods of 65 Million - 11 More Are Planned

Bryan Nelson — Tue, 28 Jul 2009 00:45:24 +0000

17 dams recently built on the Mekong River in Southeast Asia are threatening fisheries, destroying a vast ecosystem, and starving millions. And 11 more dams are currently in the planning process.

The dams already in place are blocking fish from traveling upstream to spawn, and the new dams– many of which will sit nearer the river’s headwaters– could threaten the entire river ecosystem. 65 million people currently live and rely upon the Mekong for their sustenance and livelihood, and about 80 percent of their protein intake comes from the river’s fisheries.

New Zealand Struggling to Meet its Climate Goals… because of Climate Change?

Zachary Shahan — Fri, 24 Jul 2009 20:36:01 +0000

New Zealand is considered a world leader in environmental topics of all kinds. It is a leading producer of organic produce, it conserves vast amounts of natural and ecologically diverse land, and it has taken a leading step in goals to reduce greenhouse gases and stop or slow climate change. As early as 1992, New Zealand became a part of the United Nations Framework Convention on Climate Change. However, a report released by the New Zealand government this month shows that they have experienced a sharp rise in greenhouse gas emissions since last year. The reason? Climate change.

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Canada’s Clean Coal Concept

Lisa Wojnovich — Thu, 30 Apr 2009 23:57:42 +0000

Wednesday, Canadian Environment Minister Jim Prentice announced his government’s most recent plan for eliminating CO₂ emissions. The Canadian government hopes to phase out electrical generation by modern coal technology in favor of carbon capture and storage (CCS) — the much debated and as yet unproven “clean coal” concept — nuclear power, and other, renewable sources of energy.

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Saltwater Power Could Supply Energy for Most Dutch Homes

Bryan Nelson — Sun, 08 Mar 2009 03:56:08 +0000

A new proposal to improve a 75-year-old dike, the Afsluitdijk, in The Netherlands could make it the world’s leading site for generating saltwater power— a clean, renewable energy source which is 30-40% more efficient than burning coal.

The breakthrough process, which is called reverse electrodialysis, captures the energy created when freshwater becomes saltier by mixing with seawater. Although scientists in the 1950s discovered that electricity could be generated this way, no one knew just how efficient the process could be until a recent study proved that a remarkable 80% of the energy could be recovered.

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Searaser Device Uses Waves to Pump Sea Water Uphill, Could Be Huge Boost for Hydro Power

Andrew Williams — Mon, 17 Nov 2008 17:54:05 +0000

A UK engineer has invented a device that harnesses wave power to pump sea water uphill, from where it can flow downhill to create hydroelectricity, raising hopes of a cheap, abundant source of renewable energy.

In trials, the device, called the Searaser, has pumped water more than 160ft above sea level, using little more than the natural motion of the waves. There are now plans for a much larger version, capable of pumping to a height of more than 650ft.

Inventor Alvin Smith reckons that each full-size device would be able to pump enough water to supply electricity to 470 homes. He also calculates that a fleet of 43,000 could generate enough power for a staggering 20 million households.

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Conscious Correspondence: Fun, Fresh And Fabulous Recycled Greeting Cards

Stancie Wilson — Thu, 21 Aug 2008 22:07:39 +0000

It’s no secret that I have a love affair with my internet connection but opening up the mailbox and finding a handwritten note that made its way across the miles just for muah makes me giddy each time. Because I have a ‘thing’ for paper and especially unique cards & stationery, I absolutely love it when I come across the recycled sort. But don’t get me wrong, I don’t gravitate towards the dried petals and chunky paper pulp variety.

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Why the Klamath Dams Don’t Provide “Green” Energy

Jennifer Lance — Wed, 13 Feb 2008 04:40:01 +0000

The Klamath River is sick, very sick. This once mighty river runs through the Cascade Mountain Range, from southern Oregon to northern California. In 2002, over 33,000 salmon died in a massive fish kill caused by dams on the river, as well as water diversions, agriculture, industrial pollution, mining, road building and poor forestry. In subsequent years, commercial fish seasons have been canceled and fish counts continue to be extremely low (75% lower than before the fish kill). According to the Klamath Riverkeeper,

The Klamath River, the third largest river on the west coast, was once one of the most productive salmon rivers in the country with over a million salmon returning to spawn in its waters each year. Now the Klamath River is only a shadow of its former self due to dams, diversions, agriculture, industrial pollution, mining, road building and poor forestry.

Every 50 years, the Klamath River Dams undergo relicensing, and now is the chance for dam removal. Many critics of dam removal state that the dams produce “clean,” renewable energy. Although hydroelectricity is sustainable, such as the micro hydro system that powers my home, on a massive scale it is not green. New projects are being protested worldwide. On the Klamath, algae growth caused by warm water temperatures created by the dams and diversions actually produce methane emissions, a powerful greenhouse gas.

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