Connecticut

CT adopted the next generation science standards, NGSS, in about 2015. Transition to them fully by about 2018, so climate change has been part of the official curriculum since then.

All but a handful of states adopted NGSS (Mississippi, Texas, north Carolina) do climate change is taught in almost every state

A couple of states watered down or eliminated parts of the ESS3 strand about human causes of change in climate but CT was not one of those, which were the usual red state suspects like WV and ND.