Urban tree management generates biomass waste, consisting of branches, leaves, fruit and trunks. This biomass waste has the potential to be used as an energy source, especially in industry and commerce. With this in mind, this study carried out an environmental assessment and forecast of waste from Joao Pessoa's urban tree plantations as an energy alternative. The objectives were: i) to diagnose and plan the maintenance of urban tree planting in Joao Pessoa; ii) to assess the environmental impacts and analyze different scenarios for waste from urban tree planting in Joao Pessoa, with a view to including it in the Clean Development Mechanism (CDM), and iii) to analyze the forecast volume of waste from urban tree planting in Joao Pessoa. In order to achieve the objectives, an inventory of urban tree planting was carried out using simple random sampling, a Life Cycle Assessment (LCA) was developed using the IPCC 2013 GWP 100a method, and models from the ARIMA (Autoregressive Integrated Moving Average) family were applied.