Implementation of environmentally sustainable computing in a distributed computer network is provided. A method includes receiving a request from a node in the network to perform a computational task and identifying nodes in the network having resources to facilitate performance of the task. Using an environmental impact rating for each of the identified nodes, selecting one or more transmission paths in the network and/or at least one of the identified nodes to facilitate performance of the task based on corresponding environmental impact ratings and applied performance efficiency criteria. Selected identified nodes represent those having the lowest environmental impact rating while meeting the applied performance efficiency criteria. The method further includes executing the task on the node via the transmission paths and/or selected identified nodes.