Dr Peter Ward, Univ of Washington, Life's Rivers in Time

Several times in the distant past, catastrophic extinctions have swept the Earth, causing more than half of all species -from single-celled organisms to awe-inspiring behemoths -to suddenly vanish and be replaced by new life forms. Today the rich diversity of life on the Earth is again in grave danger -and the cause is not a sudden cataclysmic event but rather humankind´s devastation of the environment.

[katesisco]

Have RARE EARTH, UNDER A GREEN SKY, and OUT OF THIN AIR. We love our geology teachers!

[CoryDavisPAg]

Love Peter Ward's books, have almost all of them. One of my hero's. Thanks for sharing this presentation!

[kevins]

It's annoying his videos generally get so few views relative to the mindless nonsense on social media. Thanks for taking the time Dr Ward.

[raginaldmars]

... as a German Biologist -
Peter Ward is a highly impressive Biologist
and Role Model for the World.
As the World has no respect for Persons like Ward
we self extinct
easy...

[a.randomjack]

Next one by, please give a like. I listened twice and liked it both times, but I think the 2nd time was better :)

[ciaranryan]

882 views. Seems like no-one is interested.