Paris ? Which is spookier: the threat of global warming or a blackout at the Eiffel Tower?

The landmark’s 20,000 flashing lights will go dark for five minutes Thursday evening, hours before scientists and officials unveil a long-awaited report on global warming.

The darkening of the landmark in the City of Light comes at the urging of environmental activists and is timed to coincide with Friday’s release of the major report warning that Earth will keep getting warmer and presenting new evidence of humanity’s role in climate change.

Ahead of the report by the Intergovernmental Panel on Climate Change, pressure is building on U.N. Secretary-General Ban Ki-moon to convene an emergency summit of world leaders aimed at breaking a deadlock over cutting greenhouse gases.

Ban has not decided whether he will push for a summit, said his spokeswoman, Michele Montas, in New York.