again 7 years back, and by no means i went back to my records and congress don edwards some of you may remember, held a hearing in 1987 on impacts of climate change on san francisco bay area and that was years back but it's getting a lot of attention but not a new issue. this graph could be temperature over time or green house gas over time. population. but what it is, actually is the number of publications scientific publication addressing climate change and water resources globally from 1950 up until the present and mike is still here. he was the lead author on this article it came out in the journal of climate change, i think, last year that looked that range of literature out there and the issues addressed and regions and topics and so on. we actually have on-line that institute this bibliography and you can do searchs by author, subject, reen on, whatever. there's the url. i stuck in the word reservoir and it turns out there's 60 some odd articles on this. so this is not new scientific subject. i'll talk about four things. what should be done. there have been proposals for decades