For most of the past half century, the arc of energy efficiency bent toward savings. Once Congress passed the nation’s landmark energy-saving law, the Energy Policy and Conservation Act of 1975, ...

Many governments see energy efficiency as a key decarbonization strategy. In fact, some scenarios assume efficiency can drive approximately 40% of emissions reductions under the Paris climate accord.

Forbes contributors publish independent expert analyses and insights. Charles Marshall is energy and water efficiency expert. Whether you are allowing someone to lease property or living in it ...