Someone doing something is always better than no one doing anything, can we at least agree on that?
With that said, more investments into other energy sources are totally welcome, and I don't think that should mean we also need to tax pollution less, we can have both :)
When the government says that the market should do something, people complain about government interference. When the government lets the market do something, but sets the right incentives, people are complaining about it again.
Co2 taxation is effectively internalizing the cost of co2 pollution. The price goes up the more we pollute, because we have less budget until we cannot reach our goals anymore.