It's not quite that simple but wish it was.
1. How we make electricity can use more fossil fuel than using the fuel directly! Other means of producing electricity have wild enviromental impacts if not dangers. No one way suits every region.
2. Battery technology is way behind. They are virtually all toxic waste haz-mats! They don't behave in extreme cold or heat -- therein lies the real hurdle.
3. When you need heat or air conditioning we just haven't engineered an efficient way to make it portable as in motor vehicles.
Note: Isaac Newton said it best oh so long ago....... "For ever action there is an equal and opposite REaction" and when you really think about it, that still stands!
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/