As the world marks Earth Day, more than 60 heads of state meet at the United Nations headquarters to sign the Paris climate agreement aimed at slowing climate change. Many countries still need to formally approve the agreement, which will only enter into force when it is ratified by 55 nations that account for 55 percent of man-made greenhouse gas emissions. Experts say the cuts promised in the deal are insufficient to avert dangerous global warming. This comes as Gulf Coast communities marked the sixth anniversary of the BP oil spill by demanding no new drilling. For more, we speak to reporter Antonia Juhasz. Her new report in Rolling Stone is "Six Years After BP Gulf Oil Spill, Residents Demand 'No New Drilling.'" Her most recent book is "Black Tide: The Devastating Impact of the Gulf Oil Spill."