The modern-day desire for community was most notably characterized by the communal movement of the 1960s and 1970s, which became more focused and organized in the cohousing and related alternative-community movements of the mid-1980s. Then, in 1991, Robert Gilman and Diane Gilman co-authored a germinal study called "Ecovillages and Sustainable Communities" for Gaia Trust, in which the ecological and communitarian themes were brought together.