%0 Journal Article %K Energy efficiency %K Energy intensity %K Efficiency policy %K Energy efficiency gap %K Public policy %A Harry D Saunders %A Joyashree Roy %A InĂªs M.L Azevedo %A Debalina Chakravarty %A Shyamasree Dasgupta %A Stephane de la Rue du Can %A Angela Druckman %A Roger Fouquet %A Michael Grubb %A Boqiang Lin %A Robert Lowe %A Reinhard Madlener %A Daire M McCoy %A Luis Mundaca %A Tadj Oreszczyn %A Steven Sorrell %A David Stern %A Kanako Tanaka %A Taoyuan Wei %B Annual Review of Environment and Resources %D 2021 %G eng %R https://doi.org/10.1146/annurev-environ-012320-084937 %T Energy Efficiency: What Has Research Delivered in the Last 40 Years? %U https://www.annualreviews.org/doi/10.1146/annurev-environ-012320-084937 %V 46 %8 10/2021