  We present how to construct a Soft Collinear Effective Theory (SCET) for
gravity at the leading and next-to-leading powers from the ground up. The soft
graviton theorem and decoupling of collinear gravitons at the leading power are
manifest from the outset in the effective symmetries of the theory. At the
next-to-leading power, certain simple structures of amplitudes, which are
completely obscure in Feynman diagrams of the full theory, are also revealed,
which greatly simplifies calculations. The effective lagrangian is highly
constrained by effectively multiple copies of diffeomorphism invariance that
are inevitably present in gravity SCET due to mode separation, an essential
ingredient of any SCET. Further explorations of effective theories of gravity
with mode separation may shed light on lagrangian-level understandings of some
of the surprising properties of gravitational scattering amplitudes. A gravity
SCET with an appropriate inclusion of Glauber modes may serve as a powerful
tool for studying gravitational scattering in the Regge limit.
