Arlington County’s new County Board Chairman Paul Ferguson said he is confident that drops in energy costs due to a new initiative to reduce greenhouse gas emissions would make up for any money spent implementing the plan.

After being elected as chair Monday, Ferguson outlined an ambitious plan to lower emissions that includes tax breaks for hybrid cars, requirements for energy-efficient public buildings and the distribution of energy-efficient light bulbs to Arlington residents. In an interview with The Examiner Tuesday, Ferguson said the cost of instituting the program is unknown.