Pentagon Climate Change Author Interviewed

cynical writes "Just in time for the opening of The Day After Tomorrow, the futurism/technology/environment blog WorldChanging has an interview with futurist Doug Randall, co-author of the "Abrupt Climate Change" scenario [PDF] commissioned by the Pentagon earlier this year. The report generated a storm of controversy a couple of months ago, and drew attention to the possibility that global warming could disrupt things enough to trigger a rapid-onset ice age. Now that the furor has died down, Randall can talk about climate change, how the report came to be, and just what he thinks about the new disaster movie."

Comments

Blowing up the Earth

[Anonymous Coward]

I don't know how much energy it would take to crack the Earth in half. But it's interesting to calculate how much it would take to "blow it out of existence", which could be loosely defined as a big enough explosion that all the bits can acquire escape velocity, and so can never recoalesce back into a planet.

The gravitational binding energy of the Earth is U = GM^2/R, where G is Newton's gravitational constant, M is the mass of the Earth, and R is its radius. Plugging in the appropriate numbers (see Wikipedia), you get 2.24x10^32 joules. For reference, if a ton of TNT is 1 billion calories (4.184 billion joules), then that works out to be 5.35x10^22 tons of TNT, or about 50 trillion gigatons. By way of comparison, I think I read that the world's nuclear arsenal at the height of the Cold War was somewhere between 20 and 50 gigatons.