2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/7957A simple discussion on the backreaction of inhomogeneities in cosmology, focusing on the possibility that it could explain the present acceleration and solve the coincidence problem.4 pages, contribution to the proceedings of the 2004 Moriond workshop "Exploring the Universe". v2: Corrected a referenceAstrophysicsGeneral Relativity and Quantum Cosmologytext