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Preventing Pollution

Evaporation from Trees Has Global Cooling Effect

Scientists at the Carnegie Institution's Global Ecology department have published a study that found that evaporation from trees has a cooling effect on the climate.

Because water vapor is known to act as a greenhouse gas, scientists were unsure what role evaporation played, but it turns out that evaporation from trees causes low-level clouds to form in the atmosphere, which reflect the sun's rays.  The scientists created models that showed that not only did cooling occur locally (which was already known), but that the effect was a global one where tree evaporation created more low-level clouds around the world.

Trees have proven themselves to be great climate regulators and this new finding just adds to the list of best prices for propecia reasons to preserve our forests and plant new trees.

via Yale e360


Harvard Professor Builds Carbon-Sucking Machine

Harvard applied physics professor David Keith is building a machine that can suck carbon dioxide from the air.  Keith has started a company called Carbon Engineering that has attracted venture capitalists that see a future for this technology.

The machine uses a three-step process to buying cialis soft tabs 100 mg filter the air and separate and sequester the carbon dioxide.  First, a fan sucks air into the machine where it enters a 31-foot-long chamber filled with wavy plastic material.  A sodium hydroxide solution runs down that plastic and reacts with the buy ultram cheap CO2 to pull it out of the air and turn it into carbonate solids.  Those solids then go into a 900 degree Celsius kiln where they're broken down and become a stream of pure CO2.  That pure CO2 is then capture where it can go on look there women levitra to be stored underground or used for other purposes.

The machine reuses ash left behind in the kiln to regenerate the sodium hydroxide solution and the process continues.

Of course the removal of the CO2 from the air is natural viagra never the tricky part of these projects, rather it's what is done with the captured CO2 that leaves people feeling unsure.  The permanence of underground storage is still untested.

But the potential for the levitra to order technology has generated some interest.  Bill Gates and inexpensive viagra other billionaire investors have given money to Keith's project and Keith himself hopes that it can be scaled up to a size that could actually make a positive impact on the environment.

via NPR




Cleaning Uranium Contamination with Bacteria

Bacteria may be a key in containing radioactive contamination and other environmental pollutants. A naturally occurring bacteria found in soil called Geobacter has been known to be useful in contaminated soil cleanup, but the process by which it prevents the spread of pollutants has not been known until the work of viagra 6 free samples Gemma Reguera and her team of researchers at Michigan State University identified how the the bacteria concentrates contaminants.

The bacteria have nanowire structures called pili, which are like fine hair on the exterior of the bacterial cells. In a toxic waste site contaminated with uranium, these nanowires essentially become electroplated by the uranium. This process contains it and renders it insoluble, so that it cannot be dissolved and taken up by groundwater.

“This tiny microorganism can play a major role in cleaning up polluted sites around the world,” Reguera says. “Uranium contamination can occur at any step in the cycle of production of nuclear fuel – from mining, processing and enrichment to accidental spills from the nuclear plant. Contamination can spread fast and buy cialis australia stay in the environment for many, many years. However, you can stimulate the natural Geobacter community of the soil and groundwater, or feed the improved strains in the environment. The bacteria will oxidize and precipitate the uranium.”

The pili also serve to protect the bacteria from the uranium, which is toxic, by keeping it outside the cell. The researchers are now working to online viagra perscription develop strains of Geobacter with increased pili production to make it more effective for this type of remediation work.

via: MSU News


New York City Bike Share Program Will Have 10,000 Bikes, 600 Stations

Last year, we heard that New York City was considering a huge bike sharing program and now it's becoming a reality. New details have been released about the program and it's just as big as had been hoped. There will be about 600 stations with 10,000 bikes and the program could be up and running by next summer.

The stations will be widespread, covering the Upper East and West sides all the way down to the tip of Manhattan and best alternatives to viagra then across the buy levitra on the internet East River into Brooklyn as far as Greenpoint and Crown Heights.

The city has chosen Alta Bike Share to install and operate the system. Alta operates bike share programs in Washington, D.C., Boston and Portland, but the New York system will dwarf those systems by a few thousand bikes, making it the largest in the country. Above is a video featuring the Capital Bikeshare program in D.C.

The program will allow for 24-hour, multi-day or annual subscriptions as well as shorter rentals charged by the half-hour. Monthly subscriptions will be cheaper than a monthly MetroCard.

Bike share programs have had varying degrees of success around the world, but we hope that this ambitious system in a city that loves alternative forms of transportation will catch on quickly.

via New York Observer


Renewable Energy Now Accounts for 25% of Global Energy Capacity

The newly released REN21 Renewables 2011 Global Status Report shows that renewable energy hit a major milestone in 2010 by making up 25 percent of global energy capacity by the end of that year.  Renewable sources supplied 20 percent of the energy consumed in 2010.

So far in 2011, renewable energy sources (solar, wind, water, biomass, biofuels, geothermal) have supplied 11.73 percent of energy consumed in the U.S., which is 5.65 percent more than nuclear power and not far away from the energy supplied from domestic crude oil.

The report states that 50 percent of renewable energy capacity is now in developing countries.  The top five countries (in order) for non-hydro renewable energy capacity are the U.S., China, Germany, Spain and India. China ended 2010 with renewables accounting for 26 percent of installed energy capacity and 18 percent of the energy consumed.

In other encouraging news, the EU exceeded all of its targets for wind, solar PV, solar thermal and we recommend natural levitra heating/heat pumps.  In 2010, renewables made up 41 percent of new electricity capacity in the EU.

For more on the state of buy cheap viagra online renewable energy in the world, including more country rankings by sector, you can check out the full report here (PDF).

via Sustainable Business

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