In this paper we show how environmental intelligence (EI) can be used to obtain evidence to support green investments focused on land use in urban and rural areas. Specifically, we propose a six step R&D process to facilitate the development and use of advanced environmental monitoring equipment to inform green investments. The six steps are: problem definition, experimental design, indicator development, hardware and software development, investment performance evaluation and outcomes communication. To help show how EI can be applied to support green investments we use a live investment as a case study. The investment we focus on is the pedestrianisation of a section of the busy Strand-Aldwych gyratory in central London (England). We first describe our activities for each stage of the R&D process and conclude with recommendations to others considering using EI to help provide an evidence base for green investment.