The article reports on the decision of Environmental Health & Engineering to issue the white paper "The First (Big) Step to Reduce Your Campus Carbon Footprints" which discusses the details of retro-commissioning, a process of optimizing an existing building's system performance to meet the original design for operational needs in the U.S. The white paper stresses that retro-commissioning is the first step in minimizing a facility's carbon footprint by energy conservation. According to the white paper, retro-commissioning can reduce 10% or more energy use in college and university buildings which meets greenhouse gas reduction goals.