Lord Kloo said:
Science goes wrong and does something stupid to the gene pool and DNA..
Hopefully we'd have the intelligence to only attempt this on a realistic scale in a controlled environment. Creating a ATP inhibitor would be plain silly and devastating for all life everywhere. Let's hope our scientists behave themselves.
Those little micro-organisms that NASA found the other day that turn phosphorous into arsenic..
Don't know much about these guys, but presumably they would struggle to adapt to other environments.
Lord Kloo's sentence about bacteria that create arsenic is wrong. When I first read it I was all like "What the shit?! Why have I been learning Chemistry? Alchemy works, so how come no-one told me?" but then I remembered that it was bacteria that use Arsenic instead of Phosphorous. This would mean your, Meatman, ATP inhibitor wouldn't work on them.
And for all you "NUKEZ WILL KILLZ ALL" people: a friend reminded me recently that Bacteria are awesome. Just as an "ATP inhibitor" wouldn't kill them all neither would nukes. For the record I don't reckon nukes'll end us now.
As an answer to OP, I don't know but I think we're set for the next 100 years, probably. Maybe we'll get a grey soup death?