Be careful, as your sources are suspect and don't speak to his research. Your mashable link is a summary of a piece from Glover Park Group, in their own words

Be careful, as your sources are suspect and don't speak to his research. Your mashable link is a summary of a piece from Glover Park Group, in their own words they turn 'strategies into outcomes', so they seem to be a firm that gets paid to shape public opinion. For that reason alone we should dismiss the messenger. While your 'the conversation.com' link seems broken, but searching on their site for Hansen returns a first result that is critical of carbon tax programs, seemingly favoring emissions trading. Yet, emissions trading is largely seen as benefiting banks to give them a new financial instrument to trade while not actually reducing carbon emissions. So, I'm left somewhat skeptical about conclusions coming from that site as well. What I'd rather see is a critique of Hansen's papers coming from the scientific community. I would give that an honest read and open consideration.