i think that an election of donald trump, as tragic as that would be, it would mean worsening for the united states than the global climate challenge. david wallace-wells, always a what of information, optimism on an important topic. that is our show for tonight. now it is time for the last word with ali velshi, in for lawrence. good evening, ali. you know, alex, sometimes we talk about serious things, once in a while, what do you talk to your colleagues about when you re not on camera? you and i had a remarkable conversation before the show, topic being, hair, which i don t think most people would think that you and i would be talking about. yeah, i mean, listen, just because you are not and enthusiastic of the hair salon, necessarily, does not mean that you don t have valid opinions. we managed to fill a few minutes a conversation. and if filled a few more minutes a conversation in front of an american audience. we ll see you soon. have a. go by. i don t kno