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We prove that for combinatorial graphs with non-negative Ollivier curvature,one has \[ \|P_t \mu - P_t \nu\|_1 \leq \frac{W_1(\mu,\nu)}{\sqrt{t}} \] forall probability measures $\mu,\nu$ where $P_t$ is the heat semigroup and $W_1$is the $\ell_1$-Wasserstein distance. This turns out to be an equivalentformulation of a version of reverse Poincar\'e inequality. Furthermore, thisestimate allows us to prove Buser inequality, Liouville property and the theeigenvalue estimate $\lambda_1 \geq \log(2)/\operatorname{diam}^2$.

Non-negative Ollivier curvature on graphs, reverse Poincar\'e  inequality, Buser inequality, Liouville property, Harnack inequality and  eigenvalue estimates