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In the last decades, products and services concerning the transportation of individuals have made the world more interconnected than ever before. Although this fact has enabled people to perform travel-related activities more effectively, neglecting the ecological footprint of those transports has created environmental problems, and as a consequence, for our societies. This study introduces a novel approach for the multi-modal journey planning problem (MMJP) and specifically proposes a hybrid solution algorithm that solves the problem of Environmental MMJP, based both on heuristic and exact algorithms. The algorithm delivers as solutions multi-modal paths that a person can follow and produce the minimum Greenhouse Gas Emissions (GHG) from the different modes of transport that he or she will use while travelling. Given a set of public transport operation schedules, emission calculation models and public …