Abstract: An environmental curtain constructed of flexible, transparent plastic strips suspended in an opening to function as a thermal barrier. The plastic strips are arranged in a partially overlapping relationship. Each strip is defined with one end having each corner cut out to an extent for producing a central solid portion. The solid central portion of the strip may be provided with a row of spaced apertures arranged adjacent one end of the strip. An inner row of spaced apertures are arranged in vertical alignment with the outer row to permit a temporary suspension loop for the strip to be defined when the inner and outer rows of apertures are aligned in overlying relationship and secured together. The strips may include side flaps adjacent the central loop that extends below the strip suspension means and allow the relative position of the adjacent strips to be changed while still suspended by the suspension means.