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Who needs international consensus on combating global warming when you’ve got resource scarcity to drive green investment? London-based banking giant HSBC released a report Monday predicting that global investment in low-carbon energy and efficiency technologies over the coming decade will at least double to $1.5 trillion from $740 billion now, but could more likely triple to $2.2 trillion. That growth will be “driven as much by resource scarcity and industrial innovation as by the raw realities of global warming.” China is set for the fastest growth and should outpace the United States by 2020, despite the Department of Energy’s massive stimulus boost. As for industry sectors, HSBC predicted more efficient transportation would lead, with $700 billion invested ($473 billion of that in the electric vehicle market), and renewable energy would grow to $500 billion by 2020.