co-author? >> he's a genius, the cartoonist for the "washington post" and has been engaged in some of the hardest hitting commentary when it comes to the issue of climate change. i spend time communicating to the public and implications of the science and so my background to talk about the issue of climate change in a new way to use the cartoon may be to engage some people that have been impervious to what the science has to say and what the implications are. >> there is an argument scientists are at odds over the topic. it's about the theory of gravity but the difference is when it comes to the issue of climate change they find the message inconvenient because we need to do something and they've engaged in the efforts to confuse policymakers about the science and that is hardly what the book is about can you describe the implications of that? >> it's one of the reasons for cautious optimism that we are confronting the problem and in the book we end on a positive note to talk about the paris agreement and the progress that has been made. it gets us halfway to where we need to be so it is easy to imagine a few years from now in the next conference we will build on the agreement and to do what is necessary to avert a catastrophic climate change so there is a path forward. the challenge is more uphill now because they want to back out of the paris agreement. we didn't realize how relevant the climate change denial would be given to turn the power election took so we have an obstacle in our way and have to deal with it. >> we are one of the two largest emitters on the planet, china and the u.s. and under president obama, we reached this monumental agreement between the u.s. and china to make dramatic cuts and that set the stage for the successful summit where the 200 nations around the world made commitments and if we are n a moderately back out, it will send the wrong message and say the u.s. as a country that goes back on its agreement and its larger than the issue of climate change. are we willing to be a good-faith partner in this larger effort to make sure that we leave behind this world for our children and grandchildren plink mac so, why were the jews killed, because of a long-standing hatred activated among the particular circumstance is tormented by the regime that was capable of whipping up the population to participate. then undertook a war into a region where there were hundreds of thousands of people are defined as enemies in their resolve to to wipe these people out. >> then alfred university professor looks at the philosophy behind frugal living in the wisdom of reality by less is more, more or less. interviewed by michelle singletary. >> the crucial thing isn't to never send money on any luxury at all tha but to be self-aware about this worth spending money on and where you just waste money or spend it because people tell you this is the kind of thing you ought to be doing or buying. >> michael eric dyso >> michael eric dyson offered of tears we cannot stop a sermon to white america looks at the country's racial divide. >> what we want is a cessation of the velocity of the stereotype and a grand thing to us of the same humanity you grant each other. >> go to booktv.org for the complete weekend schedule. .. he also served as chairman of the aman