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15% more interpersonal violence in most locations around the world and roughly 30% to 50% inter-group conflict. >> reporter: researchers also looked at how ancient civilizations may have been impacted by climate change. my studying layers of mud in the ocean and lakes and by taking rings from trees. a link between past climates an the collapse of major civilizations like the mayan empire. >> we were spriessed by the strength of our results in that we were able to observe these types of relationships around the world across different populations and throughout human history. >> all right. that ...

Establishing a link between past climates and the collapse of major civilizations like the mayan empire. >> we were surprised by the strength of our results and that we were able to observe these types of relationships around the world, across different populations and throughout human history. >> isn't that interesting? and a big thank you to cnn's jennifer delgado reporting there. make sure to tune in again next week for our new segment, "the science behind." brianna? >> thank you, christi. all right, guys, we're going to show you what's ahead for the new week. on monday, this is what you ...