Of course it's not new to him: in his letter to the American people in 2002 he said "You have destroyed nature with your industrial waste and gases more than any other nation in history. Despite this, you refuse to sign the Kyoto agreement so that you can secure the profit of your greedy companies and industries."
No doubt he has recently observed the stalling of the Climate Change juggernaut and hopes to give it a boost; interesting the he's probably better off keeping quiet because what he wants is what many people think will happen as a consequence of global warming anyway:
That quote is from security and climate experts at a conference in London on "Climate Change: the Global Security Impact" exactly two years ago in January 2007 and where Britain's former UN ambassador said: "Violence within and between communities and between nation states, we must accept, could possibly increase, because the precedents are all around." (this along with just about anything and everything bad being blamed on climate change)
"[it] could exacerbate the world's rich-poor divide and help to radicalize populations and fan terrorism in the countries worst affected"
* THIS link - also from 2007 - to John Redwood's blog: to me it seems that Osama's point chimes with BBC and EU spin on Kyoto/Bali etc.