This study is an attempt to adapt a measure to assess environmental behavioural intentions. The original version of the General Ecological Behavioural (GEB) scale is a composite of 50 performances proposed by Kaiser and Wilson (2004) to assess self-reported past conduct. Considering that researchers often assess intention rather than past conduct, we propose a modified version of the GEB scale composed of items that are written as 'intention' items which describe ecological actions that the participants intend to engage in or not, with a 6-point Likert-type scale ranging from 0 (not at all willing) to 5 (extremely willing). A total of 206 undergraduate students from Victoria University of Wellington took part in an exploratory study where they answered the proposed modified version of GEB. The participants were 62% female and 38% male, with mean age of 19 (DP = 3.47). Analyses first examined whether the items could discriminate participants in terms of their scores, with results suggesting that nine items did not. Exploratory factor analysis was then conducted with the remaining 41 items. Nine components emerged, but the first component explained most of the variance (27.5%), and the majority of the items loaded onto the first unrotated factor. Using the criteria of factor loadings > .30 and corrected item-total > .40, a total of 28 items remained which yielded Cronbach’s alpha of .94. To create two equally reliable measures of environmental intentions, the 28 items were split into two halves of 14 items each based on the behavioural difficulty of the items (Kaiser, Byrka, & Hartig, 2010). Both versions were shown to provide similar psychometric parameters, with alphas of .89 and .87, respectively. In sum, the modified version of the GEB scale is a psychometrically sound instrument that can be used for research aiming to measure behavioural intention. Additionally, the two psychometrically equal halves of the measure can be useful on experimental designs using pre-test and post-test. We discuss the several statistical steps taken into consideration to decide on a reliable measure.