The Cost of War

Picard: “Report”
Riker: “Shields are down, long range sensors are offline. ”
Data: “According to the astrometric readings we are in the mid twenty first century, from the radioactive isotopes in the atmosphere, I would estimate that we have arrived ten years after the Third world war.”
Riker: “Makes sense, most major cities destroyed, few world governments, six hundred million dead.”

-Star Trek- First Contact