Five, just five, solutions to roll back greenhouse gas emissions.

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Reduce demand in existing buildings!

One can never lose sight of the fact that there are millions upon millions of buildings that are existing and are not energy efficient, and that have to be renovated or replaced. Another speaker at the Drawdown session, Larry Brydon, reminded me of EnergieSprong, a European concept upgrading buildings that is slowly coming to North America. It's an industrial scale prefabrication of cladding that wraps existing buildings with foam, cladding, windows and doors to take it to Net Zero energy in a day or two.

It works well for repetitive designs like rows of townhouses or apartment buildings where there is less exposed area per unit, but retrofitting single-family houses will be another story.

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