  We discuss the relevance of quantum gravity to the frontier questions in high
energy phenomenology: the problems of dark matter, dark energy, and vacuum
selection as well as the problems of emergent spacetime and wormholes. Dark
matter and dark energy phenomenology, and the problem of vacuum selection are
discussed within the context of string theory as a model of quantum gravity.
Emergent spacetime and wormholes are discussed in a more general context of
effective theories of quantum gravity.
