Saturday, November 1, 2014

Hansen says planet uninhabitable, 30C warming at poles, 20C over land in 118 years

According to a recent lecture by fake-Nobelist Michael E. Mann, climate scientists "are the most conservative people on the planet," and the IPCC reports are "very conservative." 

Mann is a Climategate protege of James Hansen, and a 2013 paper by Hansen et al provides his conservative projections for the next 118 years:
If we assume that fossil fuel emissions increase by 3% per year, typical of the past decade and of the entire period since 1950, cumulative fossil fuel emissions will reach 10 000 Gt C in 118 years.  [Fossil fuel emissions were 7.8 GtC in 2005 per IPCC estimates.] Are there sufficient fossil fuel reserves to yield 5000–10 000 Gt C? Recent updates of potential reserves, including unconventional fossil fuels (such as tar sands, tar shale and hydrofracking-derived shale gas) in addition to conventional oil, gas and coal, suggest that 5×CO2 (1400 ppm) is indeed feasible. Our calculated global warming in this case [1400 ppm] is 16°C, with warming at the poles approximately 30°C. Calculated warming over land areas averages approximately 20°C. Such temperatures would eliminate grain production in almost all agricultural regions in the world. Increased stratospheric water vapour would diminish the stratospheric ozone layer.  More ominously, global warming of that magnitude would make most of the planet uninhabitable by humans.
Holy Hansen's grandchildren!

Never mind the following showing Hansen exaggerates warming by at least orders of magnitude:

It's a pity Hansen's grandchildren are used as pawns for his shoddy and unscientific alarmism. 

h/t to Kenneth Richard

Related: Time for Meds? NASA scientist James Hansen endorses book which calls for ‘ridding the world of Industrial Civilization’ – Hansen declares author ‘has it right…the system is the problem’  Book proposes 'razing cities to the ground, blowing up dams and switching off the greenhouse gas emissions machine'


  1. An order of magnitude is a power of 10. So this is 10X off or ONE order of magnitude off.

    1. Hansen is 100X off, so 2 orders of magnitude off, post corrected

  2. Compare Hansen's rabidly alarmist paper to a decidedly non-alarmist paper written in 1971 by then global *cooling* alarmist Stephen Schneider....who later switched positions in the 1980s and became a catastrophic anthropogenic global *warming* (CAGW) alarmist instead:
    Schneider S. & Rasool S., “Atmospheric Carbon Dioxide and Aerosols – Effects of Large Increases on Global Climate”, Science, vol.173, 9 July 1971, p.138-141

    We report here on the first results of a calculation in which separate estimates were made of the effects on global temperature of large increases in the amount of CO2 and dust in the atmosphere. It is found that even an increase by a factor of 8 in the amount of CO2, which is highly unlikely in the next several thousand years, will produce an increase in the surface temperature of less than 2 deg. K.


    So it's settled. We'll either warm by 20.0 C in 118 years with CO2 levels at 1,400 ppm, or we'll warm by less than 2.0 C in several thousand years with CO2 levels at 2,500 ppm (∼8 x 1971 levels).

    It's settled.

    1. Ha, that's a good one, have you seen Schneider vs. Schneider?