The big shifts in thinking and large-scale funding needed to drive a swift global transition to a climate-smart economy are far behind schedule, even if most of the technology required already exists, political officials and analysts have warned.

About $9.2 trillion will have to be spent just on new energy infrastructure and changes in land use and agriculture each year through 2050, up from $5.7 trillion today, researchers at consulting firm McKinsey & Company said on Tuesday.

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