by Matt Grocoff, Esq. LEED
In a peer-reviewed study, James Hansen stated that “if humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO2 will need to be . . . at most 350 ppm. (See Hansen’s paper here).

During the sweltering Summer of 2011 we reached 394 ppm. If every nation that made pledges at Cophenhagen were to fulfill their carbon targets by 100%, where would that take us by 2100? 770 ppm. Now that’s one of those “oh crap” numbers that keeps me up at night. That is where we are headed within my 2 1/2 year-old daughter’s potential lifetime.
We’ve got our heads up our butts if we think creating net zero energy buildings and homes is not an essential goal.
A handful of states have set goals around net zero energy (NZE) buildings. As expected, California has among the most aggressive goals:
100% new construction NZE by 2030
50% of existing building are NZE by 2030
If all new homes were built to NZE but we neglected existing homes we would still be heading toward that 770 number. As Joe Romm said, “What then for coral? For glaciers? For corn?” Will we ask “did I do enough?” Existing homes are the answer.

The Mission Zero House
We need a consolidated movement to retrofit every existing home in America and beyond. The ambitiousness of this goal is matched only by the urgency of the task.
In the meantime, the NZE for new construction tide seems to be rising. But, will it rise faster than ocean tides? KB Homes recently announced a national rollout of a net-zero energy home. This Spring US NEWS reported on ways that home builders are looking for affordable ways to deliver more energy efficient and net zero homes to consumers.
I’m speaking at the USGBC’s International Greenbuild Conference in a couple of weeks in Toronto. We know that nearly half of green house gas emissions come from buildings – 22% from homes alone. Yet over the ten year conference history with over 1,000 educational sessions and lectures existing homes have been the topic only 13 times.
If we fail to set our ships on a net zero course, it won’t be long before we need a bigger boat.
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www.MattGrocoff.com