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Earth: Extinctions & Climate

In the first half, political commentator and economist John Lott reacted to the breaking news on the riots in Baltimore, which arose in the aftermath of the death of Freddie Gray.

In the latter half, space historian Robert Zimmerman reflected on the 25th anniversary of the Hubble Space telescope which has reinvigorated and reshaped our perception of the cosmos, and he also offered commentary on current and future space exploration.

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Earth: Extinctions & Climate

Show Archive
Date: Wednesday - March 12, 2008
Host: George Noory
Guests: Peter Ward

Appearing during the first three hours, Prof. Peter Ward, the author of Under a Green Sky, discussed his latest work on hydrogen sulfide extinctions, and how we are creating the circumstances for extinctions in the future. His research has connected past mass extinctions and global warming. Greenhouse gases and the melting of the ice-caps could create a dangerous situation where the ocean currents stop circulating. The stagnation of the oceans' waters would lead to the thriving of a type of bacteria that produces hydrogen sulfide. Killing off life in the ocean and sending toxic gases into the atmosphere, hydrogen sulfide could actually turn the sky green, he noted.

The coast off of Namibia is a hydrogen sulfide "hot spot" and the eruptions can be seen in this NASA satellite photo. Curiously, it has been found that hydrogen sulfide can have startling medical benefits, putting injured people into a kind of suspended animation until they can be treated. For more on hydrogen sulfide, see this Wired interview with Ward.

He also talked about how the melting of ice and subsequent rise of sea levels will flood coastal cities. There'll be enormous costs associated with moving cities and infrastructure to inland locations, and the influx of saltwater could wipe out agriculture, he warned.

The last hour of the show featured Open Lines.

Bumper Music

Bumper music from Wednesday March 12, 2008

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