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If only my town, state or federal government would allow me the ability to significant, incentivized deductions for installing a windmill, solar, and geo-thermal systems in my house, I'd be on it like white on rice. Seriously, I would. But they don't, and to do this type of energy independent system simply makes no financial sense for the average person. ...
Incentives would be made if people fought for change. It happened here in Australia and I now have a 1.5Kw system on my roof. My power usage (and bill) has decreased by a third. Getting back to the population vs consumption debate - you can see how easy it is to HALVE your consumption with little or no effort.