tyler hamilton is here with his co-author.have you. >> in our business we say credibility is everything, the source is everything. i need to ask about you. you have admitted to doping in the past and you have admitted to lying about it. so why do i believe what you put in this book right now? >> well, the first thing i want to say, matt, is this was so hard. this the hardest thing i've ever done in my life, to come clean. i lied for a long, long time. there was sort of an -- people really encouraged me not to speak. finally -- it finally came out i planned -- i planned to take the secret to the grave. there was a federal investigation and i told the jury the truth, nothing but the truth. >> in this book are you telling the truth, whole truth, and nothing but the truth. >> absolutely. >> your name is on the book. are you confident the guy who is telling you the truth. >> we made an agreement. no subject off limits. i had access to all his materials. everything would be confirmed. spent two years talking to former teammates, wiv

cycling where a former teammate of lance armstrong says allegations that he's a drug cheat a true tyler hamilton ride with armstrong at the u.s. postal service team from one thousand nine hundred eighty two thousand and one the accusations are made in his new book entitled the secret race inside the hidden world of the tour de france doping cover ups on winning at all costs in eight hamilton says armstrong and he used illegal doping techniques strongly denies all allegations although he recently dropped his challenge of charges brought by the u.s. anti-doping agency. the doping started on us postal before lance was there. so it's not like he came in and brought this doping culture you know in the culture was already in the sport. and you know obviously it continued when he came in and then we actually like took a step up and. you know i was encouraged to the blood of the first time in the year two thousand. that was with lance meanwhile alberto contador now is the spanish rolls off to a sensational windstorm seven to respond you don't return to the sport last month after serving about data to a

tyler hamilton rode with armstrong for three of his seven tour de france wins.nd in his new book called "secret race," he details armstrong's alleged use of performance-enhancing drugs during their time together. hamilton, who is an admitted doper, told the "today" show's matt lauer that there are ways around tests that armstrong passed, and that lying has become second nature in the sport. >> i passed hundreds of tests, when i probably shouldn't have. >> how? the average person wants to know how that can happen. because the testing's pretty sophisticated. >> the testing's great. back in the day, we had doctors that were one step ahead of the testers. i denied it for years. and after a while, you get pretty good at it. you know, i've lied to you before, straight to your face. so for me, it's like a huge weight off my back. >> armstrong gave up his fight against charges leveled by the u.s. anti-doping agency about two weeks ago. >>> well, tonight the question is, are you ready for some football? the nfl season kicks off tonight, right here on nbc 4. the reigning

my name is tyler hamilton, i'm editor in chief of corporate knights magazine, with me is tobey heeps. we call our pubblesation for -- publication for economic capitalism. actors know the fuel impact of their actions. it's about information empowering markets to foster a better world. a big part of clean capitalism is regulation. a healthy, sustainable environment is a prerequisite for long-term economic growth. we ask ourselves who is the greenest president in history? who put in place the policies capitalism depends on and thrives. america's forests, rivers, lakes and air have changed dramatically over the last two centuries as have environmental priorities. also do you judge a past president on intentions, results or a combination of both? and how do you weigh them? how do you measure the impact? david roberts of "grist" magazine told me when we discussed this project with him, there's something slightly arbitrary about the exercise. opinions will differ, that's why we decided to let the experts in environmental community do the heavy lifting on this. the results are a first of its