German cities can ban diesel cars, top court rules

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Laws are needed sometimes to compel people or businesses to do the right thing, in this case, to wean off polluting diesel-engine powered cars...left to themselves, people may not be willing to make the switch to greener or less polluting options even if they know it is good for the environment because of convenience, cost factor, etc....

Qn: Can we rely on science and technology to solve our environmental problems?