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The 2007 Solar Heating Worldwide 2007 by the International Energy Agency's Solar Heating and Cooling programme indicates that the US lags in deploying flat-plate, residential solar thermal systems, yet leads in the deployment of unglazed thermal panels for heating swimming pools.

The IEA highlights the environmental impact of existing solar thermal systems with this statement: "The annual collector yield of all solar thermal systems in operation by year end of 2005 in the 45 recorded countries is 66,406 GWh (239,062 TJ). This corresponds to an oil equivalent of 10.7 billion liters and an annual avoidance of 29.3 million tons of CO₂" Follow title's link to view full IEA-SHC report.