  We investigate the effect of backreaction due to inhomogeneities on the
evolution of the present universe by considering a two-scale model within the
Buchert framework. Taking the observed present acceleration of the universe as
an essential input, we study the effect of inhomogeneities in the future
evolution. We find that the backreaction from inhomogeneities causes the
acceleration to slow down in the future for a range of initial configurations
and model parameters. The present acceleration ensures formation of the cosmic
event horizon, and our analysis brings out how the effect of the event horizon
could further curtail the global acceleration, and even lead in certain cases
to the emergence of a future decelerating epoch.
