dr. john mann, a suicide researcher who is joining me here. just you and i listening to the investigator, first things first, when you hear that it was death by hanging, asphyxia due to hanging, you were telling me that is the most common method of suicide. >> that is true for most of the world, most of the western world. but in the united states, death by gunshot is the method of suicide is the commonest suicide. half of the suicides in the u.s., 20,000 a year, die by gunshot self-inflicted. >> in this case we know it was hanging and your second observation, the fact that potentially with a pocket knife unsuccessful attempts using a belt, not having a rope, not necessarily showing premeditation. a lot of thought going into it. >> yes. it sounds like, from the description, that he didn't really plan or prepare for this for very long at all. it was probably a relatively spontaneous idea. he wasn't sure what to do and so he used whatever methods were at hand but he was clearly determined. >> dr. mann, can you help us understand how someone so be

our dr. mannls us why getting an eye checkup every year is a really good idea. >> as much as the activities, and play that kids through to the summer is important about their social development, they are not using their eyes to the degree they use when school starts. so it is important to get routine eye checks because if they need something as simple as eye glasses and you are not aware it will a affect their performance. >> reporter: with the family history of eye problems should get check earlier in life. there is tests for kids as young as a day old. children often don't know when they have a problem, seeing, so it is very important for parents, teachers and caregivers to look out for indications. >> squint ago lot, red eyes, rubbing their eyes, tiering, any of those things could be symptoms of needing glasses, blurred vision or sometimes more significant things. >> reporter: the use of led screens or mobile devices is also impacting eye sight. the doctor says there are safe in terms of the am

this triggered a tax on dr. mann and the science behind his work, all documented in his book "the hockey stick and the climate wars." michael mann, you write that in mid 1990s, scientists were able to begin to connect the dots on climate change. could you elaborate? >> we understood the basic science of the greenhouse effect nearly two centuries ago. joseph fourier, the same guy who discovered the law of heat conduction, understood that there was this greenhouse effect. so we've known for some time that the greenhouse effect exists and that we're increasing it through fossil fuel burning. by the mid 1990s, we had reached a level of formal certainly about that that we had not before reached. we could actually attach a number to it. in the second assessment report of the ipcc published in 1995, the ipcc concluded that there was now a discernible human influence on the climate. now, there's an interesting story there. the language would have been stronger than just discernible, but the delegates of certain participating

intentionally setting up a scene for runaway global warming joining me now for more on this is dr michael mann distinguished professor of meteorology and director of the earth's systems science center at penn state university and author of the book the hockey stick and the climate of wars dr michael mann welcome back but thanks tom it's always good to be with you thank you for joining us. i want to get to the to the to the methane creators i have a fascinating story it's got everybody's going whoa what's this the first you did you just published a piece about a family vacation a glacier national park in montana and you wrote for eco watch what did you see when when you got there that. provoked you enough to write an op ed about the. great well you know a family vacation is supposed to be an opportunity for you to get away from your work and as i wrote in the piece unfortunately i couldn't do that because when you visit glacier national park my work worth of the work on climate change it stares you right in the face you are looking at the specter of climate change in the dramatic retreat of the

even the faculty union that supported dr. mann at the university of virginia told me foya matters did not fall within their bailiwick. according to the ceo of the university none of my research materials or e-mails fall under the foya law. they violate terms of the federal arbitration case. there is nothing in my record which i am embarrassed. i tell you this story not because i seek sympathy but there are so many other instances where the victims cannot speak out. the so-called war on science is nothing but a diversion. the real war is being waged in the halls of academia. and within our federal granting agencies. as with the soviet union, a healthy scientific discussion is being subverted for political and personal gain. scientists who deviate from the global warming playbook are harassed, have articles, grants and proposals rejected without review, treated more harshly than their peers and removed from positions of power and influence. young scientists quickly learn to tow the party line or at least remain silent, lest they los