The idea looks like a cool new version of the old SimCity computer game. You link a city to a solar manufacturing plant to a solar farm. The plant employs the people, the farm collects the energy and the city is up and running.

But this isn’t a game, it’s a pitch from Applied Materials, a Fortune 500 company known for making computer microchips.

They call it the best idea in the last 4 billion years.

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U.S. Energy Secretary Steven Chu was on to something when he suggested we start painting our roofs white to fight climate change.

We’ll soon be able to use a specialized paint to collect rooftop solar energy, too. Could this be the answer to neighborhood Christmas light wars?

The stuff is called silicon ink, and the U.S. National Renewable Energy Laboratory says that solar cells using the technology have “demonstrated a record 18 percent conversion of efficiency,” according to cnet.com.

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Solar power comes in many forms, from rigid to thin film. The panels are shiny, gleaming and ready to harness the power of the sun.

They’re also usually silver. Yet they also come in colors, not just for looks, but for efficiency.

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Magnum D’Or Resources Inc., a rubber recycling company, now owns one of the world’s largest tire landfills in Hudson, Colorado. But they’re not going to just leave it there. Old tires are bad because they breed mosquitoes, and a tire fire will burn for months.

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Is Al Costa pulling our leg? The CEO of Delaware-based Alkol Inc. says he has a system that will convert your car to run on E85 in about an hour.

“Flexing” your vehicle with the Alkol conversion system will allow you to use one of those high-ethanol pumps, which contain a mix of 85 percent ethanol, as opposed to the normal 10 percent mix in conventional gasoline. You won’t need a brand new shiny vehicle with one of those “Flex Fuel” badges either.

How does it work? Does it work? Is it like one of those quick-fix radiator sealer bottles that high school kids used to pour into their old jalopies?

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If you want to cut your carbon footprint, you can ride your bike a little more. If you want to cut it even further (from all that exhaling while pedaling), meet the EniCycle. This one-wheeled ride has a range of just under 19 miles on a charge. But it recharges when you ride it downhill (if you dare).

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Labor Day will soon be upon us, and with it, the unofficial end of summer. Back to school time. Summer is the season for camping, getting out of the city and getting a little dirty in the woods. Some folks like to tent it. Some folks like a travel trailer, with their own bathroom (my wife included).

But one problem with campers is how much they weigh, the large vehicles needed to tow them and frequent trips to the gas station. Travel trailers are getting lighter and lighter, however, and easier and more affordable to pull. Take a look at the latest entry, from EverGreen (like the tree) in Middlebury, Indiana.

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Aug. 29 is the fourth anniversary of Hurricane Katrina and Kanye West’s “George Bush doesn’t care about black people” comment on live TV.

The rebuilding of New Orleans continues. And it’s being rebuilt in shades of green.

According to a “New Orleans Green Building Assessment” released by the Sierra Club, the devastation of 2005 has provided the city with a unique opportunity to develop a national model for rebuilding with sustainability in mind.

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The summer of 2009 has been cooler than usual in the Midwest, but Mother Nature can still pack a punch.

August has seen some 90-degree days in places like Michigan.

When it get this hot, some people like to stay inside in front of the air conditioner (based on recent Twitter and Facebook updates). But it doesn’t have to be this way.

The air conditioner, I mean.

A “whole house fan” that uses the attic for venting can keep your home cool with less electricity (and for less money) than modern-day air conditioning.

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You know the drill. You flush the toilet, walk away, come back later and it’s still running.

You jiggle the handle. Hopefully that makes it stop. Maybe you take off the top of the tank and swear a little.

Or, you could install H2Orb, a toilet gadget from a California company that takes clean tech to a whole new level.

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How do you make a better wind turbine? With lasers, of course.

The Manassas, Virginia-based Catch the Wind(TSX-V: CTW.S) has signed an agreement to work with the National Renewable Energy Lab in Boulder, Colorado, to test the company’s Vindicator laser wind sensor.

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Here’s a feather in the cap of renewable energy supporters.

When the (baseload, coal and nuclear) power went out after storms in Muskegon, a mobile renewable energy unit came to the rescue.

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A recent study concluded that it’s dangerous to text while driving.

What about texting while bicycling?

That’s also not advised, but a device from a company called PedalPower+ will charge your Blackberry while you ride. It also will charge your iPod.

The device, similar to the old school dynamo systems used to power headlamps via the back wheel of a bike, also stores generated power in a battery and will charge with solar panels even when you’re not riding, according to a report from the Austrailian Broadcasting Corp.

Gizmag, a technology blog, explains that developers spent three years working on PedalPower+, to work out the kinks of safely regulating current to electronic devices via a spinning bike tire.

As a result, the patented technology will charge a mobile phone from flat to finished in about two hours, the company says.

How much? Right now, the devices are only available Down Under. But the company says it’s setting up distributors in the United States and Europe.

(Image Credit: PedalPower+. Caption: Bottle dynamo installed on the back wheel of a bicycle.)

Pond scum just got an upgrade.

SunEco Energy is working with J.B. Hunt Transport Services, a leading transportation company, to run trucks on biodiesel mixed with algae oil.

SunEco says a blend of 20 percent and 50 percent algae oil with petroleum biodiesel has cut particulate emissions by 82 percent.

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Fairview has become the first town in Texas to build a street lit entirely by low-energy LEDs.

There are 82 light-emitting diodes on the newly constructed Fairview Parkway. The LEDs came from EvoLucia, a division of Sunovia Energy Technologies in Sarasota, Florida.

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When the sun goes down, some walkways in Birmingham, Michigan, start to glow.

They’re fitted with a phosphorescent glow-in-the-dark pavement marking system from Glow-Mark Technologies LLC of Royal Oak, MIchigan.

The system consists of encapsulated “pucks” fitted into brick pavers, wood or other material with a boring drill.

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Biomimicry is about emulating nature. Scientists at the Savannah River National Laboratory in South Carolina are using the concept to increase the efficiency of solar cells, peering into how a moth’s eye absorbs light.

Researchers at the U.S. Department of Energy lab are working with the University of Florida’s Peng Jiang to study how special coatings that mimic structures found in nature can make solar cells more productive for commercial applications, homes and even space satellites.

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Sometimes, when you ask a question, you get a good answer.

A recent post on a push to increase the U.S. gasoline blend rate ended with this thought-provoker: At this rate, will cellulosic ethanol, from non-food plant materials, ever get off the ground?

Yes, replied Sam Salyer, a representative for a Massachusetts-based biofuel company called Qteros.

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You’d think this would be a “Buy American” type of issue. Growth Energy, an ethanol industry trade group, wants to raise the content in gasoline from 10 percent to 15 percent in the United States.

The ethanol industry, of course, is firmly behind the proposal, made to the U.S. Environmental Protection Agency. Ethanol plant operators say a boost would bring jobs and investment on U.S. soil.

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Wind turbines have been around since just after the dinosaurs began making fossil fuels.

These days, a team from Purdue University and Sandia National Laboratories are working to make future blades more efficient, more cost effective and more reliable.

In other words: Plans for the smart grid, meet plans for the smart blade.

Engineers have embedded sensors inside wind turbine blades, and are testing the technology at the U.S. Department of Agriculture’s Agriculture Research Service laboratory in Bushland, Texas.

The research may result in smart blades in the future, with flaps like those on an airplane, Purdue officials say.

(Image: Purdue doctoral student Jonathan White holds a cross section of a wind turbine blade like the one used in research to improve the efficiency of turbines and prevent damage to blades from high winds. Credit: Purdue University photo/Andrew Hancock).