Tim O’Reilly says it clearly at: http://feeds.feedburner.com/~r/oreilly/radar/atom/~3/517029803/pascals-wager-and-climate-change.html
In my talks I've argued that climate change provides us with a modern version of Pascal's wager: if catastrophic global warming turns out not to happen, the steps we'd take to address it are still worthwhile. Given that there's even a reasonable risk of disruptive climate change, any sensible person should decide to act. It's insurance. The risk of your house burning down is small, yet you carry homeowner's insurance; you don't expect to total your car, but you know that the risk is there, and again, most people carry insurance; you don't expect catastrophic illness to strike you down, but again, you invest in insurance.