Topic - Highest impact projects

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sup
2121d
What are the highest impact projects (in any domain) that can be completed by humans?
sup
2120d
Electromagnetic space launch system?
2120d
"Highest impact" in what form and for whom? A tribe in Amazonas might not even notice. Also, i.e. "nukes to everyone" might destroy our world, maybe better to ask for "best impact"?
2120d
https://www.quora.com/How-much-energy-would-it-take-to-crash-the-moon-into-the-Earth Probably crashing the moon into the earth by slowing it down.
2119d
sup
2119d
Highest positive impact of most/all of the humans and other creatures on the planet. Mainly this can be reduced to: increased length and/or quality of life.