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This artist rendering provided by Together New Orleans shows Broadmoor Community Church. Global warming is producing more extreme weather. That can mean extended power outages in places like New Orleans. A grassroots network is launching “Community Lighthouses” to meet the challenge. (Together New Orleans via AP)

This artist rendering shows Broadmoor Community Church in New Orleans. As global warming produces more extreme weather a grassroots network is launching "Community Lighthouses" to meet the challenge of extended power outages. (Together New Orleans via AP)