have been reviewing nixon tapes since the 1980s, richard nixon sued the national arc iverson for control of his case. that lead to a court case, a whole different review. i ve become director of the nixon library in 2007, by that the point the review had gotten to 1972, and by court order, we were supposed to go in chronological order. the chronological review ended in 2013. national arc iverson then did i was no longer there. i had a sense of what was done. the national archives went to preservation work on the tapes. digitized them, and then they started a review, they went back to the redactions, the withdrawn parts from the earliest tapes. and i learned again, now, as a private researcher, that private research researchers could request certain conversations. when i was at the national arc iverson, i heard there was a
is almost the wrong way of thinking about the problems in terms of which species are completely disappeared. these are on which odd creatures in one location and don t have a big population so they are extremely vulnerable but when you step back and look at very common species like elephants like we saw in that video, those populations have declined enormously when you look in the big picture and if the trends, with poaching continue, you know, we could be looking at africa elephants being gone within 20 years. i think 400,000 elephants in africa right now so not like two are left but trends are alarming. there are people doing preservation work but, obviously, not enough to turn the tide on what we are seeing, unfortunately. thank you, john. good information. you can watch the full documentary, john s full documentary vanishing six mass extinction on cnn.com. we could be history on