in 1990s in latter part of career h.t. odum david m. scienceman developed ideas of emergy, specific use of term embodied energy. consider concept of emergy , briefly defined energy memory , 1 of odum s more significant contributions. concept neither free controversy nor without critics. odum looked @ natural systems having been formed use of various forms of energy in past: emergy measure of energy used in past , different measure of energy now. unit of emergy (past available energy use) emjoule, distinguished joules used available energy remaining now. conceived principle of maximum empower might explain evolution of self-organising open systems. principle has been demonstrated in few experiments , not recognized in scientific community.
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