to the earth's climate crisis. we'll talk to the author of the study. he says it's all about more trees. welcome to our viewers here in the u.s. and all around the world. i'm natalie allen. live from atlanta, "cnn newsr m newsroom" starts right now. >> our top story, iran is breaking some of its commitments it made in the 2015 nuclear deal. the nation has announced the uranium enrichment will exceed 6.37%. tie ran has violated the agreement. it says it wants to save the deal and is open to diplomacy. cnn's sam kiley following developments from moscow. what does this mean big picture,