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Do you see the line on the ridge here? >> yes. >> that green line is where the ice surface was back in the '80s. not so long ago. >> not long ago at all. it's amazing to think that just 30 years ago, where we are right now was all covered by the big ice sheet. >> i think a lot of us are shell shocked by some of the changes. it's hard to believe. >> what was it like for you to see that? >> it was emotional. really. i've been to greenland several times but going back last year, it was really obvious that the ice melt is increasing dramatical dramatical dramatically. had a huge temperature spike ...

Do you see the line on the ridge here? >> yes. >> that green line is where the ice surface was back in the '80s. not so long ago. >> not long ago at all. it's amazing to think that just 30 years ago, where we are right now was all covered by the big ice sheet. >> i think a lot of us are a bit shell-shocked by some of the changes. it's hard to believe. >> what was it like for you to see that? >> it was emotional. really. i've been to greenland several times but going back last year, it was really obvious that the ice melt is increasing dramatically. they had a huge temperature spike in april of...

Of temperature increase in such a short period of time. roughly since the start of the industrial revolution. the early 1900s. that's when we started to see our temperatures rise quite dramatically. in a short period of time. in fact, since the year 1880, we have seen our temperature rise 0.85 degrees celsius, roughly 1.5 degrees fahrenheit. that occurring in only roughly a century of time would actually baffle scientists. if we look at this chart, we should see that kind of temperature spike over tens of thousands of years. so it's that short duration of time that's alarming scientists and al...

Spike of just two degrees on average could increase the likelihood of civil wars by 50%. can you break that down? >> right, and, alex, the study wasn't necessarily saying that that would lead to that. it's saying that if trends continue as they have been in the past that that kind of a warming could cause that kind of an increase in violence. >> okay. it also talks about, though, droughts and floods and tying that to human conflict. is that a fair assessment, robin? >> right, and i think coral hit the nail on the head when she was talking about that kind of being that final spark. when you alr...

The midwest and the plains. the mississippi river watershed is the largest one we have in the country. eastern side of this where we are seeing flooding. green areas the illinois river and wabash eventually in towards the illinois and parts of the mississippi river begins rivered illinois and wabash, that's where we saw some of the record breaking flooding. as it goes downstream the river will be able to absorb it and we won't be seeing record breaking flooding like we saw two years ago. out to the west of this though incredible drought snow over the last five to six weeks. help the drought. e...