Recently an observant reader pointed out that methane is 20 times more potent than CO2 when its impact is measured over a century. But in the short term it is a far greater problem. Over the space of two decades it is estimated to be at least 84 times more damaging than carbon dioxide.
2 degrees of warming means 0.24 to 2.14 percent lower GDP growth through 2100. Four degrees means 5 to 20 percent.
Solar power has won the global argument. Photovoltaic energy is already so cheap that it competes with oil, diesel and liquefied natural gas in much of Asia without subsidies.
Despite several attempts to give it a stronger conservation focus, the convention still refers to whales as a resource for industry. Notwithstanding the current whaling moratorium, it might struggle to deliver the strong protection much of the world now expects.