The Earth really *is* screwed-- so says the Word of Cameron. A direct quote from the guide to everything Avatar "We've devastated our planet. We're neck-deep in festering industrial muck, in a trash heap of ever-expanding waster and decay. Overpopulation, overdevelopment, nuclear terrorism, environmental warfare, radiation leakage from power plants and waste dumps, toxic runoff, air pollution, deforestation, global warming, ozone depletion, loss of bio-diversity through extinction..." So much for the exaggerated state, Gandalf the Beige. Page one(of actual text), James Cameron's Avatar: An Activist Survival Guide.
In the section about flora, it says that plants from Pandora are being used to heal what's left of the Pittsburgh wastelands--and that they're *thriving.* Pandora's atmosphere is mostly CO2(18%+), Hydrogen Sulfide(toxic concentration less than 1%), Xenon(5.5%), and Argon, along with O2. Therefore, Earth *cannot* be as well off as you have tried to explain it.
Yes, there is a colony on the moon, but nothing about Mars-- sorry, but you're out of luck there. The moon is also, according to what I could find from official sources, a cess pit with more humans living in itty-bitty spaces than is safe(oh, and Earth's population is only 20 billion).
To address the Gene Banks--sorry, pretty much everything but worms, cockroaches, grubs, and humans are *EXTINCT* in every sense of the word. Power-- that's a big fish. There is an extreme energy crisis on Earth(not to mention overpopulation, eternal war, extermination of life as we know it...) is why people went to the stars(i.e. Pandora) in the first place. There is no ozone layer, all water is pretty much toxic--and tastes like turpentine after its been filtered to within an inch of its life. No, the damage is not being healed--not on the scale that you're suggesting. Enviromentalists from Na'vi Nuts(TM) are smuggling flora in from Pandora to see if they can heal the Earth, but at the rate that the RDA is arresting and torturing/killing them, I don't think that's going to well.
The Sully brothers, that's *Sully,* dear, not *Scully,* were born and raised on Earth, and until Cameron says otherwise, I'm going to say that their parents are still alive(oh, and I claim that Mini).
On the Hell's Gate--Omaticaya and Hometree situation- The RDA was never allowed to mine there in the first place. That's why they destroyed Hometree in the movie. Yes, they did mine, but they were never near Hometree. The Omaticaya clan would also never have been near starvation. The planet has incredible sustainable growth--where Earth is spiraling out of control(and into a toxic hell), Pandora maintains a constant equilibrium. They wouldn't have needed saving, and even if they did, they would have gone to another clan or Eywa(through the Tree of Souls)for help. Selfridge is, pardon my language, an evil corporate bastard. Quaritch is, once again pardon my language, an evil sadistic bastard from the depths of whatever hell spawned him. But he is a good soldier, I'll give him that. But a UN hero? Nah. One--the UN no longer exists, two--Quaritch likes killing people too much.
Have you done the i-phone app? Cause that's the only place I know of where the mining equipment was destroyed--it was only one BULLDOZER, and it was set on fire. Grace's Avatar never spent a month in ICU(from what *I* know), as she wasn't able to intervene before the hunters and Sylwanin were killed by the RDA--not Wainfleet specifically. And, from the incident you were talking about, Wainfleet wasn't there, nor was Quaritch. Quaritch arrived after Major Cage got his ass handed to him in a spectacular fashion by the Omaticaya(an Avatar named Lorenz, specifically). Trudy Chacon(ooh, another mini--You can have it, it's a mini-Turok named Trudy Chachon) would also have arrived with Quaritch, thus, she wouldn't have been able to witness the incident with Lorenz, the Omaticaya, and Major Cage.
I do apologize for poking holes in what might have been a great theory, but I had to. I love Avatar 'verse too much not to. And, this topic has already been picked over before(yes, I remember you), and should now stop. Earth is a cesspool of toxic waste, Pandora is an atmospherically-toxic paradise, and Quaritch and Selfridge are both assholes.
James Cameron is the Avatar 'verse God. What he says is Canon is FACT, therefore, when anyone says anything differently, we must stop them. I suggest reading the Survival Guide for more information.
Sincerely, the nitpicker;
-Honu_Wahine