Ocean acidification, over-fishing, warming climate and other environmental triggers may spell the next "Great Dying," but are we there yet?

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Sources:

Early Accretion Of Water In The Inner Solar System From A Carbonaceous Chondrite-like Source:

http://science.sciencemag.org/content/346/6209/623

“Determining the origin of water and the timing of its accretion within the inner solar system is important for understanding the dynamics of planet formation."

Dehydration Melting At The Top Of The Lower Mantle:

http://science.sciencemag.org/content/344/6189/1265

“The high water storage capacity of minerals in Earth’s mantle transition zone (410- to 660-kilometer depth) implies the possibility of a deep H2O reservoir, which could cause dehydration melting of vertically flowing mantle."

Why Do We Look For Water When Searching For Extraterrestrial Life?:

https://io9.gizmodo.com/5728932/why-do-we-look-for-water-when-searching-for-extraterrestrial-life

“The assumption that alien biochemistries probably require liquid water may seem a little Earth-centric. But given the chemical possibilities available from the most abundant elements in the universe, even an alien scientist with a different biochemistry would probably agree that a water-solvent-based biochemistry is quite likely to occur elsewhere in the universe – and might well be the most likely foundation for a complex ecosystem in which intelligent life could develop."

Scientists Discover The Oldest, Largest Body Of Water In Existence — In Space:

https://www.fastcompany.com/1769468/scientists-discover-oldest-largest-body-water-existence-space

“Scientists have found the biggest and oldest reservoir of water ever—so large and so old, it’s almost impossible to describe. The water is out in space, a place we used to think of as desolate and desert dry, but it's turning out to be pretty lush."

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