Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. US-Iranian Tensions Threaten to Overshadow UN General Assembly Margaret Besheer UNITED NATIONS - As world leaders prepare to gather for their annual meetings at the U.N. General Assembly, heightened tensions between the United States and Iran threaten to overshadow a summit on global warming. "Let's face it, we have no time to lose. We are losing the race against climate change," U.N. Secretary-General António Guterres told reporters Wednesday. "The imperative to act could not be more clear, and this is exactly why I am convening the Climate Action Summit." .