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waste disposal sustainable energy, waste disposal sustainable energy letpub, waste disposal & sustainable energy, waste disposal and sustainable energy, waste disposal and sustainable energy journal, waste disposal & sustainable energy if, waste to energy disposal, waste disposal and sustainable, waste to energy sustainability, sustainable waste disposal methods, waste to energy recycling, waste to renewable energy, waste to energy possibilities, waste management renewable energy, waste to energy project, waste to energy systems, waste to energy project development, solid waste to energy, sustainable use of waste, waste to energy solutions