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Now , we absolutely agree with you and one of our concerns was just what you've stated , how do we make certain that all engineering controls are implemented and that we continue to develop engineering controls , because we want to be right where you are . How do we ensure that community-driven social change is central to service-learning and community-based participatory research ? That said , how do we get from the greatly-improved-but-insufficient best available technologies to truly bright green systems ? How did we figure out what it was ? How did we reach this point ? How did we get this way ? But how did we build it ?