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Global warming is "unequivocal" and humans are turning up the heat - but more slowly since 1998, according to a report from the United Nations Intergovernmental Panel on Climate Change released today.

The impacts of climate change are among the environmental challenges facing Iran that helped spark protests in dozens of cities across the Islamic republic. At least 20 people have died in the uprising, driven by the sudden collapse of financial institutions, low wages and mistrust of national leaders. Rising temperatures are seen by some experts as an underlying condition for the economic hardships that led to the unrest.