judging from the references to Green Lantern 200 in the document

I'm guessing in the late 1980s, judging from the references to Green Lantern 200 in the document — DC Comics editors Denny O'Neil and Dan Raspler approached a few science fiction writers, including Niven, asking for help fleshing out the backstory of Green Lantern. And Niven agreed to create a document called the Green Lantern Bible, which nobody outside of DC has ever read in its entirety — but a big chunk of it is reproduced in Niven's 1992 book, Playgrounds of the Mind.Among other things, Niven replica Rolex 116518 Men's Watch clarified that the reason the power ring is a ring is because “it'll stay on almost any shape of alien.” And the Guardians are blue now, but “they evolved pink.” And Krona, the scientist who tried to view the beginning of the universe and unwittingly unleashed evil on the cosmos, is reinvented as someone who unleashed entropy, not evil.

But Niven's biggest contribution, judging from the excerpt in his book, was to flesh out the history of the Guardians, who came from the planet Maltus and migrated to the planet Oa, where they currently live.According to Niven, the Maltusians developed mental powers, which granted them near-immortality because they could wipe out any replica Rolex 118239-WR Men's Watch impurities and ailments in their own bodies. But these runaway psi powers also made it too easy for the more immature Maltusians to wipe out any predators or irritants in the natural environment, trashing the ecosystem of their planet completely. Their careless use of mental powers reduced their world to a wasteland.

So they launched a series of terraforming projects to see how they could fix Maltus — and Oa was one of these.And in Niven's version, Oa had an indigenous species before the Maltusians arrived and became the Guardians. The Maltusians wiped the natives out, with the Maltusian males tricking the females into helping by boiling an replica Rolex 118239-SD Men's Watch ocean where the natives had a settlement. When this was discovered, the female Maltusians left the males forever, becoming a separate species: the Zamorans.In the Ganthet's Tale comic, Niven fleshes out some of his history of the Maltusians, including the stuff about the scientist Krona who unleashed entropy on the cosmos.