tonight for christian parenti's book "tropic of chaos". we welcome him for that. i welcome you here on behalf of the donors who bought the book store. we're excited to have them on board and all the book sellers here. so thank you and welcome. for those of you new to the store i will quickly go over the format. christian parenti will talk about the book and we will open it up for q&a which we look forward to your input. the one thing we ask is if you get to this microphone in the middle here we will keep the talk hon.. we welcome our c-span audience as well. when it is time for q&a we will still them from this microphone and afterwards have a book signing up here. that is how we will go. turn off your self phones. a small space the ring can kind of resonate. welcome and thanks for being here. christian parenti, "the nation" contributing editor, visiting scholar at the graduate center. here tonight to talk about his new book "tropic of chaos: climate change and the new geography of violence". he has authored three previous books including lockdown america. "tropic