by Rady Ananda – Activist Post At the G8 Summit held two weeks ago at Camp David, President Obama met with private industry and African heads of state to launch the New Alliance for Food Security and Nutrition, a euphemism for monocultured,...
We're told “clean” energy is a viable and cost effective. But cut the government subsidies, and 97 percent of investors vanish (in Australia it's collapsed from $2.6b annually to $80m). The truth is that renewables are almost ...
Is President Obama's “all of the above” energy policy a success? Or a climate failure? A report issued recently by Bank of America declared the United States has now surpassed Saudi Arabia as the world's largest oil producer ...
Last month was the warmest June since records began being kept in 1880, the National Oceanic and Atmospheric Administration (NOAA) reported Monday. That follows the warmest May on record. Land and sea surface temperature percentiles in June 2014.
Kauai needs more cash to defend GMO, pesticide law Sacramento Bee LIHUE, Hawaii -- Kauai's county attorney has asked the county council for more money to defend a new law regulating genetically engineered crops and pesticides.
how corporations win? Spending more money than the good people!
The cartoonish stereotype of Australia of yesteryear featured a rough-headed bloke in an Akubra hat wrangling crocodiles. That image has finally been scrubbed from our collective memories – only to be replaced with something worse.
NBCNews.com Climate Scientists See 'Very Rapid Declines' in Annual NOAA Report NBCNews.com Leading climate scientists on Thursday issued their annual physical of Earth, comparing the planet in 2013 to a patient that's only getting worse and...
A German wind farm. Creative Commons: Chris Zielecki, 2013 Germany is currently ranked as the most energy efficient major economy in the world according to a report from the American Council for an Energy-Efficient Economy.
Environmental study highlights health affects from pollution, with Germany coming top, and the UK third in total coal consumption The UK and Germany lead a list of the EUs most polluting coal-fired power stations compiled by environmental...
A new material structure developed at MIT generates steam by soaking up the sun. The structure — a layer of graphite flakes and an underlying carbon foam — is a porous, insulating material structure that floats on water. When sunlight hits the structure’s surface, it creates a hotspot in the graphite, drawing water up through the material’s pores, where it evaporates as steam. The brighter the light, the more steam is generated.
The new material is able to convert 85 percent of incoming solar energy into steam — a significant improvement over recent approaches to solar-powered steam generation. What’s more, the setup loses very little heat in the process, and can produce steam at relatively low solar intensity. This would mean that, if scaled up, the setup would likely not require complex, costly systems to highly concentrate sunlight.
Hadi Ghasemi, a postdoc in MIT’s Department of Mechanical Engineering, says the spongelike structure can be made from relatively inexpensive materials — a particular advantage for a variety of compact, steam-powered applications.
“Steam is important for desalination, hygiene systems, and sterilization,” says Ghasemi, who led the development of the structure. “Especially in remote areas where the sun is the only source of energy, if you can generate steam with solar energy, it would be very useful.”
Ghasemi and mechanical engineering department head Gang Chen, along with five others at MIT, report on the details of the new steam-generating structure in the journal Nature Communications.
Today, solar-powered steam generation involves vast fields of mirrors or lenses that concentrate incoming sunlight, heating large volumes of liquid to high enough temperatures to produce steam. However, these complex systems can experience significant heat loss, leading to inefficient steam generation.
Recently, scientists have explored ways to improve the efficiency of solar-thermal harvesting by developing new solar receivers and by working with nanofluids. The latter approach involves mixing water with nanoparticles that heat up quickly when exposed to sunlight, vaporizing the surrounding water molecules as steam. But initiating this reaction requires very intense solar energy — about 1,000 times that of an average sunny day.
By contrast, the MIT approach generates steam at a solar intensity about 10 times that of a sunny day — the lowest optical concentration reported thus far. The implication, the researchers say, is that steam-generating applications can function with lower sunlight concentration and less-expensive tracking systems.
The “Godmother of Punk,” influential American musician, poet, writer and artist Patti Smith has pledged her support for the protection and preservation of the Arctic, adding her name to academic, political, artistic and activist luminaries from...
nation.lk - The Nation Newspaper Exclusive: First 5 Minutes Of Food Documentary 'GMO OMG' Indie Wire (blog) Is food that has been genetically modified to withstand adverse weather conditions and insects, or to yield a greater crop, healthy for...
Beach-goers in Russia were surprised with a sudden hail storm when Mother Nature went absolutely insane. The post Mother Nature Goes Absolutely INSANE With A Sudden Hail Storm In Russia appeared first on Banoosh.
A mysterious crater almost the size of a football field discovered in a remote part of Siberia's Yamal peninsula known as the end of the world may have profound implications about the stability of Arctic methane and catastrophic climate change.
"The striking puncture in the earth is believed to be up to 80 metres wide but its depth is not estimated yet. A scientific team has been sent to investigate the hole and is due to arrive at the scene on Wednesday.
The cause of its sudden appearance in Yamal - its name means the 'end of the world' in the far north of Siberia - is not yet known, though one scientific claim is that global warming may be to blame."
Russian experts have ruled out speculation that meteorite impact might have caused the crater. The crater was certainly not caused by a meteorite because it has no central crater but instead has a deep hole. Meteorite impacts have far too much energy to leave an open hole. (Note: I studied meteoritics for my first year of graduate school.) Likewise any other extraterrestrial source would have far too much energy to leave an open hole. The impact site would be filled with ejecta.
It doesn't appear to be a sink hole because the hole is surrounded by a rim of ejected material. Genarally, sink holes don't have elevated rims because they are produced by collapse of surface material into a preexisting covered hole. The ejecta appears to have been produced by an explosion. This crater formed in one of Siberia's largest natural gas producing regions. Permafrost in this area is melting in response to the rapid warming of the Arctic.
The most likely cause of this crater is a methane explosion. See the update at at the end for a discussion that this crater was caused by the melting and collapse of an ice dome called a pingo. An Australian expert on Arctic landforms suggested pingo collapse created this crater, but Russian experts have not yet commented on his hypothesis.
Click headline to read more, view pix and graphic map of methane levels and watch video clip--
Don't worry, big guy; climate optimists say you'll be fine on a warming planet. We all have that crazy uncle who shows up at family reunions, trying to convince us that climate change isn't real and Barack Obama was born in ...