Osama bin Laden's foray into climate change has sparked a lively guessing
game on Twitter as to what subject the Al-Qaeda chief, seen here in this
undated file photo, may choose to address on his next tape. (AFP/File)
US President Barack Obama speaks during a town hall meeting in Elyria, Ohio on January 22. Al-Qaeda chief Osama bin Laden lectured the US and other industrial nations on climate change, and urged a dollar boycott in response to American "slavery," in a fresh verbal assault. (AFP/File/Saul Loeb)