Pascal's wager on Climate Change

Tim O’Reilly says it clearly at:

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.