if there was a huge industry tthat would stanand to profifit greatly if the theory of gravity were wrwrong, you wouuld see the theheory of gravity being contested in our u.s. senate. >> talk about the hockey stick and why it became such an icon in ththe climate debabate. >> well, it's this curve that my co-authors and i publishshed now 15 years ago. we attempted to estimate the temperature of the earth back in time. now, there's only about a century of widespread thermometer measasurements around d the wor. so we can only document fromm instrumental measurements, thermometers, how the globe has warmed over the past century to century and a half. and we know it's warmed about a degree celsius, about a degree and a half fahrenheit. what the instrumental record can't tell us is how unusual is a warming like that over that period of time. could it be that that sort of warming happens naturally over a century time scale? to try to address that and relatated questions about hw the climate h had changed in the past, my co-authors and i attempted to make use of what we call proxy climate records--

thunited s states has been on the wrwrong side of history from the beginnnning of this.s. the united states has made its contribution since vietnam, at least, to the destruction of hospitals and civilian civilities, most recently in afghanistan. was it deliberate? i don't know. it was probably an accident. mr. roth's view, everything is certain and everything is deliberate. i am more problematic. look at what is happening in syria today. it is interesting. the russians and the syrian some months ago took back palmyra where the islamic state been chopping off heads in public, where it had lined up its victims and had young children, looked to be about 10, 11, 12, executed. reportedhumaman rights that an protested that. in the syrians liberated the city. now palmyra is under siege again.n. the isislamic state may take control of the city. what is the u.s. doing about it cap co this is what we should be asking. amy: your response? >> let me finish my point. you filibustered, , let me makey point. he inonot mentionened those old, and whether the same thing is happening in moz