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"We self-flagellate sometimes about our carbon footprint, but we dont even realize what that means."
Alternative energyWhen electricity is needed, say, after the sun has set, the hot liquid — Alternative energy
"When electricity is needed, say, after the sun has set, the hot liquid silicon -- so hot that its glowing white -- is pumped through an array of tubes that emit that light. Specialized solar cells, known as multijunction photovoltaics, then turn that light into electricity, which can be supplied to the towns grid. The now-cooled silicon can be pumped back into the cold tank until the next round of storage -- acting effectively as a large rechargeable battery. "One of the affectionate names people have started calling our concept, is sun in a box, which was coined by my colleague Shannon Yee at Georgia Tech," Henry says. "Its basically an extremely intense light source thats all contained in a box that traps the heat."
Alternative energy
Alternative energy
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Renewable energy is energy made from renewable natural resources that are replenished on a human timescale. The most widely used renewable energy types are solar energy, wind power, and hydropower. Bioenergy and geothermal power are also significant in some countries. Renewable energy installations can be large or small and are suited for both urban and rural areas. Renewable energy is often deplo
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"Even if we wanted to run the grid on renewables right now we couldn’t, because you’d need fossil-fueled turbines to make up for the fact that the renewable supply cannot be dispatched on demand."
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"[[w:Technological innovation|[T]echnology innovation]] in clean energy is at the core of the solutions to climate change."
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"The assumption that high jet steam wind speeds in the upper atmosphere correspond to high wind power has now been challenged by researchers of the Max Planck Institute for Biogeochemistry in Jena, Germany. Taking into account that the high wind speeds result from the near absence of friction and not from a strong power source, Axel Kleidon and colleagues found that the maximum extractable energy from jet streams is approximately 200 times less than reported previously. Moreover, climate model simulations show that energy extraction by wind turbines from jet streams alters their flow, and this would profoundly impact the entire climate system of the planet."
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"With an efficiency of 97 percent, bicycle technology is nearly perfect. So why do we use it only for transportation?"
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"Biofuels have grabbed the attention of engine researchers ever since the oil-crisis and escalating costs of petro-chemicals cropped up in the ׳70s. Ethanol and methanol were the most widely researched alcohols in IC engines. However, the last decade has witnessed significant amount of research in higher alcohols due to the development of modern fermentation processes using engineered micro-organisms that improved yield. Higher alcohols are attractive second/third generation biofuels that can be produced from sugary, starchy and ligno-cellulosic biomass feedstocks using sustainable pathways. The present work reviews the current literature concerning the effects of using higher alcohols ranging from 3-carbon propanol to 20-carbon phytol on combustion, performance and emission characteristics of a wide range of diesel engines under various test conditions. The literature is abound with evidence that higher alcohols reduce carcinogenic particulate emissions that are prevalent in diesel engines."
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