The government does have an essential role to minimize externalities--impacts from our behavior that are not captured in the price of a good or service.
I'd rather see the government do this by applying taxes to account for negative impacts rather than tax credits or other benefits for potentially "good" technologies, to include cap and trade schemes. Other regulations (such as restrictions or bans on particular technologies) have their place as well. This gives the individual maximum choice. They can stick to the old technology, they just have to pay for it. This also gives the market maximum flexibility to find better alternatives that do not have the impacts that are being suppressed by the tax.
These opinions are my own and do not reflect the opinions or policies of my employer.
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