  This is a short account, based on a talk given at the 2024 Moriond Cosmology
Conference, of where and why string theory matters in early universe cosmology.
It is written for a cosmology audience predisposed to be at best sceptical, and
at worst contemptuous, of the notion that either quantum gravity or string
theory has any relevance for their discipline. I cover inflation, CMB tensor
modes, extended kination or tracker epochs and reheating.
