Regrettably, James Hansen seems more concerned to save capitalism than to save the planet. You would think the opposite for a climate scientist. Compare Hansen, for example, with the UK's Kevin Anderson. But, on economic issues he not only has learned nothing, but refuses to learn. There's an extensive literature out there, notably Richard Smith's "Green capitalism: the God that Failed", which shows that carbon taxes cannot save us because they present no LIMIT to emissions. They're just a cost of doing business. That's why the CEOs of ExxonMobil, Shell and other all SUPPORT CARBON TAXES. They're not looking to go out of business.They understand that it's just a tax, like other taxes, and it can be passed on to consumers. They understand that a carbon tax is fully compatible with GROWING FOSSIL FUEL PRODUCTION. That's what Hansen, boneheadedly, misses entirely. If we really want to suppress carbon emissions there's an obvious way to do that: ban new production, shut down fossil fuel extraction, ration fossil fuels, force a transition to renewable energy, away from fossil fuel vehicles, and so on. Like the government banned DDT, thalidomide, mercury, asbestos, HFC refrigerants. But Hansen will have nothing to do with the Left, doesn't want to "intervene" in the market because, for him, the market system has to prevail -- even if it means the end of the humans. Scientists can be very smart about their discipline and very dumb about other issues.