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Study: Grid-Tied Solar Still Outperforms Solar with Storage, and Politicians Should Take Heed

Posted by Matt Power, Editor-In-Chief

Feb 1, 2017 8:27:15 PM

Yes, the world needs better batteries, but the possibility of freedom from the grid should not become an excuse for dismantling net metering.

A Univ. of Texas at Austin Cockrell School of Engineering report just published research suggesting that home batteries for solar create more GHG emissions than grid-tied systems.

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The 71 Percent Solution to Climate Change

Posted by Matt Power, Editor-In-Chief

Jan 27, 2017 5:02:13 PM

If you think America is destined for a return to blackened skies and foul waters, you haven’t read the fine print. Progress is here to stay.

A new survey of U.S. attitudes arrived on my desktop from the ReportLinker.com search engine. The survey found that more than three-fourths of U.S. citizens agree that human activity is the main cause of climate change. Just as importantly, more than two-thirds are worried about air pollution and water pollution. Many other environmental issues also concern them.

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Pipelines, Pipedreams, and Politics: What’s at Stake?

Posted by Sara Gutterman

Jan 26, 2017 9:31:53 AM

President Trump’s methodical dismantling of environmental regulations and myopic attempt to revive controversial pipelines is based on ‘Alternative Facts’ that will, ultimately, hurt the American people.

Since the day he set foot in the Oval Office, President Trump has pledged allegiance to the fossil fuel industry, putting on a characteristically gaudy show of shredding environmental regulations, fast-tracking the construction of the Keystone and Dakota pipelines, and abandoning climate action.

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Sustainability: Plans Go Marching When We’re One

Posted by Natalie M. Smith, Guest Columnist

Jan 25, 2017 9:16:28 AM

As a child I used to observe ants from time to time while sitting on the picnic bench at recess. I’d watch them trailing in an invisible line, each carrying a crumb back down the leg of the table to their tunneled community below my feet. Often times, bands of ants would break out of line in unison to carry a particularly heavy piece together— an unspoken natural order.

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CDC Surrenders to White House Climate Deniers Before the Fight for Human Survival Has Even Begun

Posted by Lauren McCauley, Common Dreams

Jan 24, 2017 2:32:58 PM

"Some might argue they should have said, 'We're going to do this and make them tell us no.' But that was the decision they made."

In another signal of the anti-science chill that has descended upon federal government, the Centers for Disease Control and Prevention (CDC) has quietly cancelled a long-planned climate summit in anticipation of its unpopularity within the Trump administration.

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Sustainability Symposium 2017: Optimism Wins the Day

Posted by Sara Gutterman

Jan 19, 2017 2:09:05 PM

Green Builder Media’s Sustainability Symposium 2017: Ready for Anything exceeded all expectations, offering an abundance of inspiration, assurance, and intelligent solutions for the transition to a sustainable future.

When we first conceived of the Sustainability Symposium 2017: Ready for Anything, we understood that it was time to elevate the national dialogue about intelligent solutions for a resilient future.  What we didn’t realize was how timely and relevant this event would become, and how important of a role it would play in galvanizing influencers and inspiring action at a local, municipal, and citywide scale.

I was fortunate to have the opportunity to kick off the day with opening remarks, during which I recognized that it is a pivotal moment in time—some sustainability professionals fear that the hard-earned progress that we have achieved in the areas of climate action, resource efficiency, renewable energy, and green building is under threat. 

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Smart Plus Solar Equals Total Control

Posted by Juliet Grable

Jan 17, 2017 3:41:13 PM

The Arc House demonstrates ways to integrate renewable energy with connected technology.

SMART HOME TECHNOLOGY and solar technology provide complementary benefits: reduced energy use, improved efficiency, and greater comfort and control by homeowners. The Arc House demonstrates how these technologies can fully integrate to create an intelligent, efficient home—one that automatically adjusts to optimize energy use and comfort, and provides feedback to occupants that encourages them to change their behavior. 

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Don’t Be Afraid of the Dark

Posted by Ron Jones

Jan 12, 2017 10:03:54 AM

Some years ago, a good friend of mine went to the trouble and expense of finding an out-of-print copy of collected works by the great American poet Wendell Berry. He then made it into a gift to me.

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With Radiant Floor Heating Systems, Thermal Mass is not the Answer

Posted by Terry Alsberg, Guest Columnist

Jan 9, 2017 9:22:55 AM

High mass radiant is an outdated technology. The secret to performance, comfort and energy savings is low mass, high conductivity.

For decades, the term "thermal mass" has been used when describing radiant floor heating systems. Used in this context, it refers to the ability of a high mass radiant floor assembly to store heat.

This concept went mainstream in the 1960s and 70s when "passive solar homes" were growing in popularity. A dark colored, high mass slab made of Portland cement (or gypsum concrete), would sit under south-facing windows and soak up the heat from the sun all day long. When the sun went down, the slab would emit its stored heat to the habitable space for the next several hours.

While this method worked in some locations in the house, it was not an adequate heating method for an entire home. So tubing was installed and covered with concrete in other parts of the home. These homes were therefore a combination of radiant floor heating and passive solar. Because this combined system was common during this era, the term "thermal mass" and "radiant heat" are often thought to be synonymous, when in fact, they are not.

However, this same thermal mass which is so essential to a passive solar home is also the cause of the most common complaint with  radiant heat – it's slow. In every home, the heat load changes – up or down – can change quickly making it impossible for high mass systems to respond. It is common for these homes to be too cold in the morning and too hot in the afternoon (overshoot and undershoot). If the house has been unoccupied for a stretch of time, homeowners may have to wait over 24 hours for the system to adequately heat the home.

While the history of passive solar with radiant heat is interesting, given a blank sheet of paper, no one would design a heat system that acted primarily as a storage device. Any heating system, whether forced are or radiant floor heating, has the sole purpose of transferring heat into a specific space. Homes lose heat because heat flows from the warm interior to the cold exterior. A low mass radiant heating system with more conductivity allows heat to be produced at the same rate at which it is leaving the house, allowing the interior to maintain a constant level of comfort.

Conductivity, as we know, is the property of a material that allows heat to flow through it. Concrete is inherently a mediocre conductor, making it a poor choice for conducting heat. But aluminum is 240x more conductive than concrete. Because the amount of heat that must be supplied by a radiant panel is constantly changing due to weather changes, occupancy or just personal preference, the ideal heating system is able to quickly or decrease output in order to maintain optimum comfort.

With a high-mass system, the conditioned space is inconsistent and slow to respond to the needs of the occupant. On the other hand, highly-conductive, low mass radiant floor systems provide greater comfort through fast response.

Remember – Conductivity, not mass, is king.

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Live from CES 2017: An Ocean of Innovation

Posted by Sara Gutterman

Jan 5, 2017 9:50:59 AM

This week, I’m reporting live from the Consumer Electronics Show (CES) in Las Vegas, where today’s smartest, zaniest, and most innovative minds have converged to showcase ingenious technologies.

If you’ve never been to CES, allow me to paint a picture for you—imagine Disneyland for tech geeks filled with endless gidgets and gadgets that do almost anything you can think of, drones filling the skies, robots roaming the hallways that would make even Rosie from the Jetsons jealous, connected electric vehicles that run on solar power, Artificial Intelligence powered products that make your home smarter than you are, wearables that track your every biorhythm, and TVs, oh those illustrious high –def TVs, everywhere (literally, everywhere!) in a wall-to-wall jam-packed, high-energy sea of human invention. 

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Green Roofs, Green Buildings

Posted by Matt Lee, Guest Columnist

Jan 3, 2017 12:08:17 PM

Vegetative roof systems are one of the most sustainable options available in commercial roofing today.

Vegetative or green roof systems are being seen on commercial buildings around the world. This innovative system uses actual, living plants, which grow above a waterproofing membrane on top of a commercial building where a roof would normally be found. In addition to being beautiful and to increasing the aesthetics of the building itself, vegetative roof system have a number of benefits, all of which add up to one, very attractive roofing option.

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Study: Total Energy Created by Solar Panels Has More Than Compensated for CO2 from Fossil Fuel Used in Their Manufacture

Posted by Matt Power, Editor-In-Chief

Jan 3, 2017 11:11:07 AM

One of the few criticisms of photovoltaic panels has been put to rest by a new study that looks at total energy output from solar 1975-2014, compared with the oil used to make them.

Here's an excerpt:

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States That Ignore Energy Codes Could Be Making A Fatal Mistake

Posted by Matt Power, Editor-In-Chief

Jan 2, 2017 1:27:41 PM

Wild variations in the jet stream are pushing colder air south, where homes are poorly insulated, and scientists say this may be the tip of the iceberg.

ONE OF THE GREAT PLEASURES of living in places such as North Carolina and Northern Florida is the temperate climate. I've lived in both places, each time in a cinder-block ranch with no insulation, aluminum window frames and central air conditioning and baseboard electric radiators. The Florida home even had jalousied windows, little more than a translucent shutter system. But that was 20 years ago. And things are changing in a way that none of us could have anticipated. It's possible that much of the United States could be facing a "big chill."

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