  We build a conceptual coupled model of the climate and tidal evolution of the
Earth-Moon system to find the influence of the former on the latter. An energy
balance model is applied to calculate steady-state temperature field from the
mean annual insolation as a function of varying astronomical parameters. A
harmonic oscillator model is applied to integrate the lunar orbit and Earth's
rotation with the tidal torque dependent on the dominant natural frequency of
ocean. An ocean geometry acts as a bridge between temperature and oceanic
frequency. On assumptions of a fixed hemispherical continent and an equatorial
circular lunar orbit, considering only the 41 kyr periodicity of Earth's
obliquity $\varepsilon$ and the $M_2$ tide, simulations are performed near
tidal resonance for $10^6$ yr. It is verified that the climate can influence
the tidal evolution via ocean. Compared with the tidal evolution with constant
$\varepsilon$, that with varying $\varepsilon$ is slowed down; the Earth-Moon
distance oscillates in phase with $\varepsilon$ before the resonance maximum
but exactly out of phase after that; the displacement of the oscillation is in
positive correlation with the difference between oceanic frequency and tidal
frequency.
