. >> up next, elizabeth gould and paul fitzgerald take a critical look at u.s. policy towards afghanistan and pakistan and discuss the fight for control of the border region between the pashtuns and punjabis. from city lights back store? the -- city lights bookstore in chicago, this is about an hour. >> we are very delighted to be hosting paul fitzgerald and elizabeth gould. they are a husband and wife team since 1977, journalists, documentary film makers. they were the first american journalists in 981 -- 1981 permitted to enter afghanistan behind soviet lines. they have worked for cbs news, they've produced a documentary for pbs, they've appeared on abc's nightline. they have produced the documentaries, "afghanistan: between three worlds," and "the woman in exile returns." they are the authors of "invisible history: afghanistan's untold story" which is published by city lights, and i'm happy tonight to be celebrating together with all of you the release of "crossing zero: the afpak war at the turning point of american empire," which is the companion volume to

. >> that was elizabeth gould and paul fitzgerald on booktv. for more on the authors and their work visit invisiblehistory.com. >> we ask what are you reading this summer? here's what you had to say. send us a tweet at booktv using the tag summer reading to let us know what you plan on reading this summer. e-mail us at booktv/c-span.org. up next author and professor eric posner. the university of chicago's kirkland and ellis professor of law will speak on international law and the difficulty of a climate change treaty and the balance between security and liberty. mr. posner is the author of "law and social norms" and "the perils of global legalism". he is the co-author of several other books including "climate change justice" and "the executive unbound: after the madisonian republic". >> host: this is booktv's monthly author call in program where we feature one author and his or her body of work. we were pleased to pro -- host eric posner, a law professor at the university of chicago and we are in chicago at the chicago tribune with fast and we