First, they provide a way to further define and understand the Earth and the limits of life-which is the current scientific motivation for biological and geological research activities there. Preservation of static lifeless landscapes could be based on two attributes. Thus, these two sites provide alternate possible futures for the Moon and Mars. Today, human activities in Antarctica are carefully regulated with a view toward preservation while in the Atacama Desert resource mining has extensively altered the landscape. For all intents and purposes, these are static and lifeless landscapes. In the soil of both locations life is absent or cannot grow and the timescales of landscape evolution vastly exceed human timescales. On what basis do we make decisions on the preservation or utilization of such lifeless landscapes? Here I suggest that static lifeless landscapes on other worlds have some parallels on Earth in the upper elevations of the Antarctic Dry Valleys and the central depression of the Atacama Desert in Chile and Peru. However, when we consider the Moon, Mars, and other worlds we encounter profoundly static and lifeless nature with essentially no history of human interaction. Levine and Shelton then played off each other for the outro and sang the very last note together.Environmental ethics and policy have been largely developed around the concept of nature as a dynamic collection of living beings in direct interaction with humans. The two jammed out to the instrumental before Levine jumped back in, climbing up to some high notes and holding them out. Then, the song picked up in intensity as some strings joined in for the bridge. When he sang, 'In other words, I love you,' Levine responded with an 'Awwh, thank you, buddy.'

Shelton then took over with his signature country twang. When Levine sang the lyrics, 'In other words, hold my hand,' Shelton jokingly inquired, 'Me?' to which Levine quickly said, 'No!' Fellow Coach Kelly Clarkson was sitting in the audience watching this and got a kick out of it. Levine started off the song, crooning sweetly while wearing a sleek black suit. Meanwhile, the venue they sang in was equipped with lavishly-dressed patrons elegantly sipping their drinks while listening to the music. The performance was accompanied with artsy, black-and-white lighting while some upbeat, swing horns played.

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