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The Railway Association of Canada (RAC) recently launched an online "Rail Freight Greenhouse Gas Calculator," which is designed to calculate air emissions generated by a specific rail shipment.

Shippers can access the calculator on RAC's Web site at www.railcan.ca to enter a shipment's weight and total kilometers. The tool then calculates total greenhouse gas emissions.

Each year, Canadian railroads move two-thirds of the nation's surface freight by volume, yet only generate 3 percent of greenhouse gas emissions, RAC said.

"This tool helps our customers and others better understand the difference they can make by choosing rail, on a shipment-by-shipment basis, and by making better environmental choices overall," said RAC Vice President of Corporate and Public Affairs Bruce Burrows in a prepared statement.