Architecture firm Perkins&Will has gone too far with claims that a luxury timber home on a Canadian mountain removes more atmospheric carbon than it emits, argues Fred A Bernstein.

For much of last winter, Perkins&Will, an architecture firm with 25 offices from San Francisco to Singapore to Sao Paulo, used a photo of a wooden house in British Columbia as one of the "hero images" on its website.
The house, which sits alone on a mountaintop overlooking the Soo Valley 90 miles north of Vancouver, is certainly beautiful, but the firm had other reasons for splashing it across its homepage. The 321-square-metre dwelling, known as the SoLo House, is meant to be a model of sustainability.
Entirely off the grid, it is designed to operate with power from 103 solar panels on its south facade, a 96-kilowatt-hour battery pack to store electricity for nights and cloudy days (both of which are frequent in British Columbia), and a hydrogen fuel cell for winter. With all that equipment, the house may well be able to function without utility hook-ups. But Perkins&Will has made a far more surprising and audacious claim: that the building's structure is "beyond carbon neutral," meaning that it will remove more carbon from the atmosphere than it emitted in the first place.
It seemed to be giving its clients permission to build willy-nilly at a time of climate crisis
In a slickly produced video on the firm's website, Perkins&Will architect Alysia Baldwin says...