[7][1] In 2011, he and Hans Joachim Schellnhuber, among others, were part of the Pontifical Academy of Sciences panel, to discuss and advise the Vatican on climate engineering.

[8] Robock was a lead author in Working Group I for the 2013 published Fifth Assessment Report of the Intergovernmental Panel on Climate Change (Chapter 8).

The study estimates that with their current number of warheads, a nuclear war between the US and Russia could generate 150 million tons of soot, thanks to massive fires ignited by explosions.

The soot would quickly cover the globe and block incoming sunlight, creating the equivalent of a shade and causing drastic global cooling.

The research concludes that nuclear winter could result in an estimated 5 billion deaths from famine if global calorie production drops by 90 percent.