  It is generally believed that quantum gravity is necessary to resolve the
known tensions between general relativity and the quantum field theories of the
standard model. Since perturbatively quantized gravity is non-renormalizable,
the problem how to unify all interactions in a common framework has been open
since the 1930s. Here, I propose a possibility to circumvent the known problems
with quantizing gravity, as well as the known problems with leaving it
unquantized: By changing the prescription for second quantization, a
perturbative quantization of gravity is sufficient as an effective theory
because matter becomes classical before the perturbative expansion breaks down.
This is achieved by considering the vanishing commutator between a field and
its conjugated momentum as a symmetry that is broken at low temperatures, and
by this generates the quantum phase that we currently live in, while at high
temperatures Planck's constant goes to zero.
