How do you recommend governments act to reduce carbon emissions?
If I were the government, I would do it by mandated carbon emission levels per watt of power generated by power companies. The idea is similar to the way that fuel efficiency standards were mandated for automobiles and led to vastly more fuel efficient cars.
This is something that a government can mandate, because the technology is here, and power plants can already make a profit from a mix of renewables (solar/hydro/wind/etc), it just isn't as profitable in the short term as coal because renewables tend to have a longer ROI period than fossil fuels. But if the government mandates the mix the power supplier must have, then the power companies will have to comply. The power companies will still make sufficient profit in the long term.
I am a firm believer in climate change, but I think a tax designed to reduce power consumption is wrong-headed. The progress of civilization is related to the power usage of that civilization. Individuals in first world countries now use more power in a day than people 1000 years ago would use in several months. In the future to continue to progress, our civilization will use more power.