By starting from ontological first principles, this approach renews intuitive connections between environmentally induced decoherence and gravitational phenomena underpinning the hypothesis that cosmic acceleration, dark matter phenomena, dark energy and gravity emerge indirectly from intrinsic exponential quantum gravitational decay of all mass-energy across cosmic time. The quantum gravitational underpinning inducing gradual universal mass evaporation is hypothesized to originate from analogous Hawking radiation arising at the cosmic horizon boundary where recession velocities reach light speed.