Osama bin Laden, the leader of Al Qaeda, blamed the United States and developed countries for not halting climate change and said that the global economy should immediately abandon its reliance on the American dollar, according to an audiotape released Friday by the broadcaster Al Jazeera.

“Talk about climate change is not an ideological luxury but a reality,” Mr. bin Laden was quoted as saying in a report on Al Jazeera’s English-language Web site. “All of the industrialized countries, especially the big ones, bear responsibility for the global warming crisis.”

The authenticity of the tape could not be immediately confirmed, and Al Jazeera, which is based in Qatar, did not say how it had obtained the message.

But if substantiated, it would be Mr. bin Laden’s second public message within a week. On Sunday, Al Jazeera broadcast a one-minute tape in which Mr. bin Laden hailed the Dec. 25 attempt to bring down a plane bound for Detroit and warned of more attacks against the United States.