Concentration of CO2 in the Atmosphere

Understanding the Blower Door Test

Air infiltration at outlet. Blue is colder area indicating air coming from outside. Courtesy photos.

Michael Canavan

I received a call from a homeowner saying they had a blower door test done to find out how well their house was sealed against drafts. They were looking for any places that air could be […]

Recycling Glass into Aggregate – Glavel

Glavel foam glass aggregate is a super-light insulating gravel. Courtesy photo.

George Harvey

Glavel is a company based in Burlington, Vermont. It sells foam-glass aggregate. Some people might look at it and ask what good it is. Others will be delighted with its possibilities.

Science is […]

DIY Energy Upgrades: Basements

Foam insulation on walls and poly vapor barrier on floor. Photo courtesy Dave Keefe.

Dave Keefe

Most of us don’t think much about our basements, especially if we have one that isn’t particularly pleasant. But the basement is part of the house, and what goes on there affects our fuel bill and how […]

Time to Re-imagine Capitalism

Alan Betts

There are many areas where rapid change is needed to confront and deal with climate change and ecosystem degradation. But our societies mostly refuse to face and discuss these issues. Some of this is nostalgia for the past. We dream of the days in the 1950s and 60s when the consumer economy grew […]

Greenbacks to Back Greening!

Bean-counting toward sustainable living

James Kaplan

This year, G.E.T. motivated an attempt, on my part, to study and summarize two very important reports released by the Intergovernmental Panel on Climate Change (IPCC). The IPCC is a group of scientists from everywhere, and they organize through the UN. Participants number in the thousands.

After being familiarized […]


Greta Thunberg: Time Magazine’s 2019 ‘Person of the Year’. Wikimedia Commons.

John Bos

With global emissions reaching record levels and showing no sign of peaking, UN Secretary-General António Guterres called national leaders to come to New York last September 23 for a Climate Action Summit. Guterres’s goal was to highlight concrete promises by […]

Australia is in Trouble. So Are We.

Weather caused by fire. Source: EPA Australia.

Green Energy Times Staff

Australia has a wildfire season every year. The worst of the bushfires occur in the summer months, late December through late March in the southern hemisphere. On the first day of the Australian summer, it was already a […]

AeroBarrier Case Study: Lower Level of Brick Church, ca 1869

Nate Gusakov

This is the fourth article in this series, highlighting our experiences installing AeroBarrier around New England. Here’s a quick refresher on the technology.

The lower level of this former Methodist church is being used for offices. Air leakage was reduced by 87% using AeroBarrier. Courtesy photo.

AeroBarrier is a patented building […]

Lewis Creek Cottage: Net-Zero Energy with a View

All images courtesy Ryan Bent Photography

Barbara Whitchurch

The Lewis Creek Cottage is a net-zero-energy home designed by Rolf Kielman (AIA, Leed AP) for TruexCullins Architecture + Interior Design. It was designed for his daughter, her husband and their new baby boy. Kielman told me that the family was fully on board with […]

Rockingham Roasters Gets a Free Lunch

From Saxtons River Solar Electric

Rockingham Roasters. Photos courtesy of Saxtons River Solar Electric.

George Harvey

Saxtons River Solar Electric (SRSE) installs heat pumps, in addition to solar photovoltaics (PVs). Some people might ask why a solar installer would do that. After all, the technologies are completely different. The answer, however, […]