In the short-term, hybrid cars are a stopgap solution to help reduce our dependency on oil. Otherwise why would the government offer tax incentives to those who purchase hybrid cars?
In the long run, it will take many years before we are completely nondependent on oil. It's not just automobiles and gas. Our military is highly dependent on oil. How many barrels (of oil) do we use per day in our "War on Terrorism"? And then look at all the products we have that are made out of plastics or plastic-derivatives (which come from oil).
But hybrid cars and hydrogen-powered vehicles is certainly a start. There will also probably be a revival of nuclear power and wind-generating stations.
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