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Home builders know buyers want "green" homes. So they leap on the easiest opportunity to make a few simple modifications to the home and then slap a green label on it. To justify this "green" label, they is seal off all the air flow between the home and the outside world, thereby creating an "air tight" home that has virtually no air leaks. Because this results in lower costs for air conditioning and heating, they call this a "green" home. And because home construction regulators are absolutely clueless about green living, this all gets the big thumbs up even though it's not green at all!
Why isn't it really green? Because when there's no air exchange with the outside world, the density of toxic chemicals in the air INSIDE the home skyrockets! Where a "leaky" home would vent out high concentrations of the toxic chemicals off-gassing from paint, carpets, glues, particle board furniture, varnishes and construction materials, a so-called "green" home traps all these toxic chemicals inside the home, greatly increasing the risk of cancer to its occupants.
Because this results in lower costs for air conditioning and heating, they call this a "green" home.