The theme of this year is "invasive species". The head of the UNEP still quoted 1.4 trillion as the global economic cost of invasive species annually.
David Pimentel was the lead author for the 2001 paper that came up with that figure, here is what he said about that figure,
"The $1.4 trillion ... is still credible today...I would rank agricultural weeds as number one and rats as number two," he wrote in an e-mail, asked to name what he reckoned the most destructive aliens, which can thrive in new habitats when freed of natural predators (more from the Reuters article).
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