Dr. James Hansen of NASA, has been the world’s leading promoter of the idea that the world is headed towards “climate disaster.” There is little evidence to back this up.
In 2008, Hansen wrote about “stabilizing” the climate :
Stabilizing atmospheric CO2 and climate requires that net CO2 emissions approach zero, because of the long lifetime of CO2
Yet in 1999, he made it quite clear that past climate was not stable, and that there was little evidence to support that idea that the climate was becoming unstable.
Empirical evidence does not lend much support to the notion that climate is headed precipitately toward more extreme heat and drought. The drought of 1999 covered a smaller area than the 1988 drought, when the Mississippi almost dried up. And 1988 was a temporary inconvenience as compared with repeated droughts during the 1930s “Dust Bowl” that caused an exodus from the prairies, as chronicled in Steinbeck’s Grapes of Wrath.
In that same 1999 report, he showed that US temperatures peaked in 1934, and declined through the rest of the century.
