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In a U.S. First, a Commercial Plant Starts Pulling Carbon From the Air
(www.nytimes.com)
This is a most excellent place for technology news and articles.
What if we genetically modified the algae to be impossible to kill and survive in extreme conditions. Like the algae equivalent of kudzu.
Now coming to everyone soon: algae world! All algae all the time! Covered in slime? That's worth a dime! There is no escaping it, not even a bit.
It'll be fine.
If it gets out of hand we'll just engineer an equally hardy and aggressive rotifer to kill all the algae.
You're basically exchanging a world-ending Gray Goo Scenario for a world-ending Green Goo Scenario.