The Sierra Club, a grassroots environmental organization, has partnered with the Donlen Corporation, a vehicle fleet management company, in a strategic alliance to enable commercial and municipal vehicle fleets to monitor and reduce their carbon emissions. “Donlen’s Carbon Calculator tool, which we tailored for this program, successfully provides a full picture of carbon costs and economics for the vehicle fleet community,” says Gary Rappeport, CEO of Donlen. “Fleet managers cannot make effective decisions in a vacuum. Simply looking at isolated carbon data will not provide the complete picture. With this calculator, carbon-conscious decision makers can now reach a conclusion that is well-received by an organization’s environmental and finance teams, just as our existing clients also use this resource.” Available at, the tool allows vehicle fleet managers to accurately determine and compare global warming and air pollution emissions, as well as fuel and maintenance costs for all types of vehicles. For example, the tool calculates that a hybrid vehicle can cost 22 percent less to operate, and emits 46 percent less global warming pollution over a three-year period, than the average mid-size sedan. In addition, the tool provides a financial analysis of carbon output and how it affects the organization’s bottom line.