Archive for the ‘hemat energi’ Category

Highly efficient fluorescent light bulbs are widely touted as environmentally friendly, but they have created a recycling headache for the EPA and local governments. More often than not, their toxic ingredients simply end up in landfills, where the chemicals can leach into soil and water and poison fish and other wildlife.

The bulbs contain mercury and should not be tossed in the trash like regular light bulbs.

“They’re very efficient, but once they’re used up they become a ticking toxic time bomb,” said Leonard Robinson, chief deputy director of the California Department of Toxic Substances Control. “They need to be captured and recycled.”

The bulbs remain a good choice for the environmentally conscious, however, because the amount of mercury they contain is less than what is generated in the production of the extra electricity required to light an incandescent bulb.

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Submitted by LiveScience Staff
posted: 21 September 2009 11:14 am ET

Researchers have shown the benefits of a new approach toward eliminating carbon-dioxide emissions at coal-burning power plants.

The system, called pressurized oxy-fuel combustion, separates the carbon-dioxide emissions produced by the burning of coal, in the form of a concentrated, pressurized liquid stream, from other emissions. This allows for carbon dioxide sequestration.

That means, in theory, the liquid CO2 stream could be injected into geological formations deep enough to prevent their escape into the atmosphere, a process other researchers say could work as a way to store the carbon for eons, thereby keeping it out of the atmosphere.

A paper describing the research, led by Ahmed Ghoniem at MIT, was published in August in the journal Energy. The Italian energy company ENEL, the sponsor of the research, plans to build a pilot plant in Italy using the technology in the next few years.

(Read full story at MIT )

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Trees, in a word, rock. They absorb heat-trapping carbon dioxide, hold soil together to prevent landslides, and provide a rich habitat for diverse plants and animals. Choose furniture made from eco-friendly sources such as sustainably managed forests, bamboo, and reclaimed wood. Buying vintage wherever possible, rather than adding something new into the waste stream, is always in style. Also, look for furniture that is durable and likely long-lived-you’ll save money on replacements in the future and prevent more wasted materials from winding up in the landfill. And, if for some reason, that dresser or dining table no longer suits your needs, something in fine shape will always have takers via Craig’s List, eBay, or Freecycle.
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