  In the early Universe, dark energy may have a non-negligible contribution. If
this dark energy corresponds to an early cosmological constant, it leads to a
late-time huge dark energy density which is much larger than what is expected
for the current expansion of the Universe. Using a conformal coupling of the
quintessence to the dark matter, and based on the screening models, we propose
a process to reduce the early dark energy to its ultimate value in the late
time. Early and late time dark energies can be unified in a single component,
in this way.
