When a politician works up a CO₂ emissions target, he picks one that he can sell politically. He picks one that will have no measurable effect on the economy. He picks one that no major corporation will strenuously object to. He picks one that will be almost painless. Even the carbon taxes are refunded to many users. He picks one that will have almost no detectable effect on CO₂ levels.
When a scientist works up a CO₂ emissions target, he picks one that will barely save the planet from becoming uninhabitable. He knows even that will be much too constrictive for politicians to consider, so he can forget about a safety factor. All he can hope for is politicians might be more flexible once the politician’s fruit trees wither.~ Roedy (1948-02-04 age:69)