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A phenomenological formalism is presented in which the apparent accelerationof the universe is generated by cosmic structure formation, without resort toDark Energy, modifications to gravity, or a local void. The observedacceleration results from the combined effect of innumerable localperturbations due to individually virializing systems, overlapping together ina smoothly-inhomogeneous adjustment of the FRW metric, in a process governed bythe causal flow of inhomogeneity information outward from each clumped system.After noting how common arguments claiming to limit backreaction are physicallyunrealistic, models are presented which fit the supernova luminosity distancedata essentially as well as $\Lambda$CDM, while bringing several importantcosmological parameters to a new Concordance. These goals are all achieved witha second-generation version of our formalism that accounts for the negativefeedback of Causal Backreaction upon itself due to the slowed propagation ofgravitational inhomogeneity information.

Apparent Acceleration and an Alternative Concordance from Causal Backreaction