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To piece together the history of early life and the rise of oxygen. Theres this close waltz, if you will, between the history of earths physical environments and the history of life. Narrator geologist paul hoffman studies the time in our planets history when the climate was much more extreme, a period called the snowball earth. Hoffman during the maximum cold of the snowball earth, you have an earth thats more like mars than it is like earth. Narrator hoffman is seeking answers to how the earth entered this snowball and, more important for us, how it returned to warmer conditions and has main...

Examining earths rock record to piece together the history of early life and the rise of oxygen. Theres this close waltz if you will, between the history of earths physical environments and the history of life. Narrator geologist paul hoffman studies the time in our planets history when the climate was much more extreme, a period called the snowball earth. Hoffman during the maximum cold of the snowball earth, you have an earth thats more like mars than it is like earth. Narrator hoffman is seeking answers to how the earth entered this snowball and, more important for us how it returned to war...

None can support complex life except earth. But the conditions on earth were not always so suitable for life, and scientists are working to reconstruct the history of two essential requirements whke tlanet hatable. The first is free oxygen in the atmosphere. The other is a moderate and stable climate. Paleontologist andy knoll has spent much of his career examining earths rock record to piece together the history of early life and the rise of oxygen. Theres this close waltz, if you will, between the history of earths physical environments and the history of life. Narrator geologist paul hoffma...

Male announcer this is the bay area news station, kron 4 news starts now. The president with tough talk about syria, but tonight we know where hell draw the line with our troops. New at eight bay fire burning in yosemite. Tonight hear firsthand those flames. Plus why some bay area guests are going to have to catherine im catherine heenan. Right now. Snakes in the grass taking human form in the bay area. What you need to know about your property of snakes. But secretly planning to sink their fangs into your catherine the socalled snake scammers are targeting unsuspecting and south bay. Using an...

More than two dozen hurt. Rob marciano is standing by. The plane crash into that mountain in alaska. How did everyone survive . The tourists onboard. Tonight, our interview right here with a survivor. And the rescue teams who asked, how did the pilot pull this off . And tonight, the new surveillance of George Clooneys crash, thrown from that scooter. Just how lucky he was and how it all happened. What the other driver is now saying. Good evening. And its great to have you with us here on a very busy wednesday night. And we begin with President Trump on the attack. The fight beginning at breakf...