Continuing from Part 1: Monster #2 Greenhouse Gases (“GHG”) alter ecosystems.
The biggest impact of anthropogenic GHG hits the oceans. There is no doubt about the importance of the oceans as a great sink, 2/3rds of the planet. After all, the oceans have saved humanity’s butt ever since industrialization started emitting CO2 over 200 years ago.
Sorrowfully, CO2 with consequent global warming, when excessive, literally kills the oceans. As it happens, the oceans absorb 30-40% of CO2 and 80-90% of planetary heat. Otherwise, one can only imagine the awesomely horrendous, gruesome, horrid consequences, but maybe not, as human imagination has trouble focusing on total annihilation. It never seems a reality.
However, a new carbon sink theory claims the oceans have maxed-out, thus unable to absorb additional CO2 after taking up approximately 130B tons of CO2 over the past century (all-time approximately 38,000 gigatons of CO2, which is 16xs terrestrial CO2).
Further to the point, it is believed the oceans could reverse course and start emitting CO2, a “reverse sink,” at some juncture. The implications are daunting, putting it oh so mildly.
Also, dreadfully, ocean chemistry is changing because of excessive CO2, more acidic, thus imperiling the life cycle of pteropods, tiny pea-like free-swimming snails at the base of the food chain that multiply by the billions, maybe trillions, serving as a source of sustenance for everything from krill to large whales. Analyses of pteropods in the Southern Ocean revealed failure to fully develop protective outer shells (acidification at work), which inhibits maturation and reproduction. It goes without saying, after enough time, it could evolve into a major ecosystem collapse.
Not only is the marine food chain at risk, excessive warming kills coral, for example, one-half of the Great Barrier Reef, one of Nature’s Seven Wonders of the World, died in 2016-17 from extreme heat. Scientists around the world were, and still are, totally freaked-out.
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