It's an extreme solution certainly, but not without merit. I doubt there'd ever be a willing acceptance of such a plan though, so a slightly more realistic solution would need to be moderated some. How's this for dystopian-but-not-quite-genocidal:
Worldwide lottery, a small percentage (total of 500M - 1B maybe) wins the right to live in what will be the new model of the world: something like what we have now, but with drastically reduced usage of non-renewable resources (until they can be replaced completely) and a target of zero negative impact on the environment as a whole. Still some version of democratic (generally at least), freedom of whatnot and such, open travel to the degree that sustainable transportation options allow, all the (again, sustainable) mod cons. I suppose different countries / regions could still run things according to their preferences, as long as the net-zero goal remains.
The other lottery entrants, the non-winners, don't need to die, hooray! They will however live on something akin to reservations, as serfs, without the right to further reproduce. These poor bastards, in exchange for not being outright murdered to save civilization, are to be consolidated into agricultural communes to do whatever they can to regrow the world's flora and fauna until they all eventually die. Their goal is not net-zero, but as far into the positive as possible. It would all be overseen according to some grand scheme(s) to be as beneficial for the overall future of humanity and life on Earth in general as possible.

Probably also unworkable, but preferable to megamurder?

Show me a study that isn't by a well known Vegan doctor who, btw, helped Oprah jumpstart an entirely unnecessary mad cow disease scare back in 1996.

Give me a link from a person who isn't described like this on their wikipedia page:

"Retired physician Harriet A. Hall, who is known as a skeptic in the medical community,[23][24][25] has written that, while it is well-accepted that it is more healthy to eat a plant-based diet than a typical Western diet, Greger often overstates the known benefits of such a diet as well as the harm caused by eating animal products (for example, in a talk, he claimed that a single meal rich in animal products can "cripple" one's arteries), and he sometimes does not discuss evidence that contradicts his strong claims."

A SINGLE MEAL can cripple your arteries. One meal. This is the person you are linking me to.

I should link you to Jillian Mai Thi Epperly and her 'jilly juice' which she claims expunges Candida from the body, and so by drinking a gallon of the juice every day, one can cure themselves of virtually any ailment, including autism, cancer, HIV, Down syndrome, and homosexuality.[2] The creator also claims that the juice can regrow lost limbs.

You don't have Vegan superpowers. At best you have a slightly better chance to live longer than someone else with a similar genetic makeup. That is science, that is fact.

*ditto

But the invincibility point is nonsense. Most humans die from old age, so, yes, you wouldn't be invincible if you didn't die from aging, but that doesn't mean you'd still live a short or normal lifespan.

Also, WikiPedia says naked mole rats live up to 31 years. Is that when their tunnel cave-in is always scheduled by Naked-Mole-Rat-Jesus?

It'd be something to clone a human with the ability to stop aging like naked mole rats and the ability to regrow limbs like salamanders.

still even if it took 20 years to regrow a limb, that would be huge.

Nerd rap infests your internet. You left a trap, but it's empty.
MC Frontalot took a gape but the bait wasn't tempting,
ending up uncaged and at large
to talk smack at you through the networking appliance that's in charge
of every drip of your attention.
Yo, when mine goes out I've got to log in just to mention
my disappointment at the interruption of convenience.
I mean just: a lot left, but none up in between this
couple of minutes here and a couple of minutes later.
It's an outrage, at the price I paid. These dictators
of my leisure rule with an iron fist.
Has anybody ever been so put upon as this?

Your GPS run out of battery (first world problem)
Got to wake up Saturday (first world problem)
You just delayed a honeymoon (first world problem)
Pledge season's coming soon (first world problem)
Half your friend list is spam accounts (first world problem)
And your center channel speaker's out (first world problem)

Muffy, my hair regrowth cream is mostly ineffective
and I'm struggling to keep this in perspective,
but I feel like a massive injustice occurred.
Says "regrows hair" on the tube (in the words)
in a third — or maybe a quarter — of all users.
I must have got swindled. Is it a fault? Of whose is?
Oooh, Muffy, Muffy, I had all the servants tortured.
Did you keep them on retainer? Do you got some more on order?
'Cause I can't comb my hair on my own no more.
I got accustomed to the lifestyle, sniffed upon the spore
and it molded up my innards, made the blood turn blue.
Muffy, Muffy, there's a revolution; what we're gonna do?

Misplaced the Ambien (first world problem)
Left a participle dangling (first world problem)
You're scheduling your root canal (first world problem)
Your grad schooling had no rationale (first world problem)
You didn't like your appetizer (first world problem)
Your yacht got capsized (a first world problem)

Now while our capitalism is in a minor kerfuffle,
you have to hustle. Before the fates come, reshuffle.
Rustle up another couple grievances and air 'em.
You can laugh about it later (maybe needed while despairing).
For the moment though, you ordered half caf, didn't get it;
there was no TV set when you jetted; internet resetted
itself just as I was in the middle
of tournament play, and so I suffered from transmittal
interruption. Completely ruined my day.
MC Frontalot's a jackass, that's all I'm trying to say.
People buy CDs in these days of disaster,
so poor me: I have to be a professional rapper.

No bubbles in the soda cup (first world problem)
App crashed when you loaded up (first world problem)
Phone's OS is outta date (first world problem)
Colors won't calibrate (first world problem)
They never stock the snack you want (first world problem)
Caught herpes from a celebutante (first world problem)

Got wallhacked in PVP (first world problem)
Oh no, HD-DVD (first world problem)
Pixels aren't perfect square (first world problem)
Your favorite rapper isn't debonair (first world problem)
You own too many underwear (first world problem)
And you're not much of a millionaire (first world problem)

Oh man, the teeth regrowing was cool.

AH FANTASTIC ARGUMENT FROM IGNORANCE

Although yes the placebo affect is valid and Yes It is very important that we research and understand how mutch the mind and thinking can heal people. lets not then use that as a catalyst to start believing in non evidential non reasonable philosphies.

Just because my skin can regrow without medical intervention dose not make my skin magic and super natural. ore some insane thing that lies outside the con finds of everything else. Scentests don't fully understand how some things can regrow themselves and others not this is simular to how we don't understand the "placebo affect" fully.

If this program is actually reasonable then i take back my comments but im 95% sure its gonna be bs from the music editing and what was sead in this clip. It look like it was made by the retards who did that thing "the secret" .

*promote for being one of the best ideas I've ever heard for regrowing forest ecosystems in a cost efficient way while engaging the local populace in maintaining and earning a living from the forest.

This is bullshit.

The whole point about resistant bacteria is that whatever else might be "wrong" with them, they are more fit and better adapted if there are drugs/diseases that kills their non-resistant cousins present The fact that they never get back to "normal"(whatever that means) is an EXCELLENT example of Darwinian evolution, if the resistant bacteria has to mutate and evolve to survive better, it means it changes, and thus the process of speciation actually speeds up.

The key to evolution is really islands. Islands can be physical geographic islands like Madagascar, Australia or galapagos, or it could be lakes, or it could be a different climate or conditions on the same continent ie: desert and jungle. in the case of bacteria, the islands can be simply two human bodies. if one person takes a drug that kills most of the bacteria, and he continues to take the drug, the few drug-resistant bacteria will regrow a population, if the other person doesnt take the drug, his or her body will keep the non-resistant bacteria.

The key to evolution is TIME, over time, these populations evolve separately, eventually becoming different species, like us and the chimps. We'll share most of our DNA (98.6%, actually), but we will differ enough (1.4%) to be unable to interbreed, thus classify for a distinct species.

Your comment hit the nail on the head. I couldnt agree with you more. Thanks for taking the time to write it.

In reply to this comment by RhesusMonk:
I'm gonna take this opportunity to get a little corny; if you have a weak stomach, skip to the next comment.

This video, and most like it, make me tear up. It seems as time goes on, I come to this place (the sift) more and more just to get my fill of all that is wrong with people on this planet. It's great to feel a sense of purpose by showing myself who and what I'm up against in this world, but from creation science to multinational corporate control to a disinterested population growing out of control, it can get a little overwhelming. When I'm confronted with how amazing things really are around here, geologically or otherwise, I still get wide-eyed and I feel like I'm in fourth grade again, learning that earthworms can actually regrow parts of their bodies. I guess this place is a real mixed bag, and the extremes are getting more and more extreme. Or maybe I'm just growing older and seeing things a little differently.

Or maybe I've just got problems.

Anyway, thanks for a touch of the old catharsis, Eric. Sometimes, I think we're all guilty of forgetting what's good.

I'm gonna take this opportunity to get a little corny; if you have a weak stomach, skip to the next comment.

This video, and most like it, make me tear up. It seems as time goes on, I come to this place (the sift) more and more just to get my fill of all that is wrong with people on this planet. It's great to feel a sense of purpose by showing myself who and what I'm up against in this world, but from creation science to multinational corporate control to a disinterested population growing out of control, it can get a little overwhelming. When I'm confronted with how amazing things really are around here, geologically or otherwise, I still get wide-eyed and I feel like I'm in fourth grade again, learning that earthworms can actually regrow parts of their bodies. I guess this place is a real mixed bag, and the extremes are getting more and more extreme. Or maybe I'm just growing older and seeing things a little differently.

Or maybe I've just got problems.

Anyway, thanks for a touch of the old catharsis, Eric. Sometimes, I think we're all guilty of forgetting what's good.

According to this recent Scientific American article (Page 4), finger-tips grow back naturally. They're one of the few body parts that do.

http://www.sciam.com/article.cfm?id=regrowing-human-limbs&ec=su_limbs

You know from the size of the tree trunks where I live, that nothing here is older than about 50 years old. That means that almost everything at some time has been cleared. In some ways,this realization offers some consolation, because to look at, you wouldn't think we live in a barren wasteland.

There's quite a lot of greenery and trees, so it shows that nature can regenerate and regrow. You only have to look at some old photos of the timber-getting days to realise however, that this greenery is but a sad shadow of what used to exist. Trees with trunks so thick 5 men couldn't touch arms around it, were everywhere, then. There's nothing like that anywhere, now.

There's no majesty in nature here, now. Just a struggling attempt at regrowth that gets knocked down every few months with each new housing development that our corrupt and immoral government allows with its stamp of approval.