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Has anyone advanced the theory that global warming could do that? I think you're exaggerating it a bit.
Accelerated species extinction is a believable threat, however, if local ecosystems change rapidly. Humans are very adaptable to changing conditions (though vulnerable in general due to overpopulation), but most simpler organisms aren't, as evidenced by the sheer number of species which have gone extinct since the Industrial Revolution. This can nonetheless impact humans either directly (changes in arable land, migration of pathogens to populations with low immunity, etc.) or indirectly (the pharma industry relies heavily on "leads" from naturally occurring substances, and lowered biodiversity would hit them hard).
I hope no one's claiming that global warming will trigger Day After Tomorrow-type cataclysms overnight.
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