AHRI filed suit in 2008, claiming that while states may establish building codes, the 1975 Energy Policy and Conservation Act (EPCA) gave federal law supremacy over local law when it comes to appliance efficiency. The City argued that the code’s performance-based compliance paths allowed builders to use products not exceeding federal... Read more

American municipalities currently discharge 32 billion gallons a day of treated wastewater back into natural sources, from which water is drawn for further treatment prior to use. A new report from the Water Science and Technology Board of the National Academy of Sciences (NAS) concludes that treated wastewater could instead be safely returned... Read more

Updated April 8, 2025; updates by Elene Drosos

I began an eight-month sabbatical in 2011 with a bicycle trip through the Southwest. I chose the Southwest in part because I wanted to have time to think about some of the vulnerabilities we face—particularly with climate change—and what we should do about it. From what climate... Read more

Architecture 2030 says new energy projections from the federal government show the building sector is on its way to achieving long-term goals in energy and carbon reductions.

The organization’s 2030 Challenge asks architectural firms to meet progressively rising standards in building energy use and emissions, with the ultimate goal of... Read more

Is the greenest building the one you don’t build? The answer is a resounding “usually.”

Conventional wisdom about building reuse is questioned and quantified in a much-anticipated report released today by Preservation Green Lab, part of the National Trust for Historic Preservation. Using a life-cycle assessment (LCA) approach that... Read more

Dynamic glazing—coated plastic or glass that changes tint in response to light, heat, or electricity—has been around for decades as a feature of eyeglasses, mood rings, and digital watches. Similar technologies have been developed more recently to make dynamic glass at a much larger scale for architectural applications. These so-called smart... Read more

The report refers to building codes as “the DNA of a city—rules that are applied many times over [with] an exponential impact on how the city functions.” Russell Unger, executive director of Urban Green Council, the New York chapter of the U.S. Green Building Council, says one benefit of the code review process has been to draw... Read more

By Erin Weaver

The Urban Land Institute (ULI) and the Greenprint Foundation have come together to form the ULI Greenprint Center for Building Performance. Designed to facilitate information exchange throughout the real estate and land-use industries, this collaboration unites ULI’s 30,000 members with the foundation’s goal of reducing... Read more

During these spring-like days in mid-February in Vermont, it's hard not to think about climate change. It's been reaching the mid- and upper-40s over the past few weeks in a winter that really isn't. Yes, this particular year might... Read more

Editor's note: Thanks to Evan Dick for this guest post. Evan is a former writer from BuildingGreen and now works at the Center for EcoTechnology in Massachusetts.

The adage "If it's yellow let it mellow, if it's brown flush it down" might be an... Read more

Even before you choose an exterior paint product, it's important to learn a bit about what makes paint stick--or not. For... Read more

In this final installment of my ten-part series on resilient design, I'm taking a look at where our food comes from and how we can achieve more resilient food systems... Read more

There is so much confusion about energy modeling--what it should cost, what benefits it offers, how to approach it--that clear statements addressing these questions are like a breath of fresh air.

When I was... Read more

By Peter YostDariush Arasteh, a leading researcher and scientist in glazing and window performance, died on February 3, 2012, after a nearly ten-year struggle with a rare form of cancer. He was 51 years old.

For 30 years, Dariush was a leader in all aspects of window energy efficiency research at Lawrence Berkeley National Laboratory (... Read more

BuildingGreen has been defining what makes a product green since the start of the GreenSpec directory in 1998--and we're repeatedly surprised by how far and wide our list of green attributes travels. The... Read more

Interdisciplinary, cutting-edge, and combining high-flown philosophical ideas with practical nuts-and-bolts advice, the BuildingEnergy Conference in... Read more