NOLA.comObama says 'there's no greater threat to our planet than climate change'NOLA.comPresident Barack Obama and Italian Prime Minister Matteo Renzi reach to shake hands following their joint news conference in the East Room of the White House in Washington, Friday, April 17, 2015. The leaders discussed Europe's economy, a pending ...Obama to visit Everglades to speak about climate changeMiami Herald (blog)Obama's Earth Day trek to Fla.