... to vote for members of Congress who will fund space watch programs?
This level of ocean evaporation is commensurate with atmospheric temperatures rising to over 500 degrees Celsius for a few weeks after the impact, and remaining above 100 degrees Celsius for over a year. That’s what models have predicted would occur for collisions with asteroids 50 to 100 kilometers across.
In fairness, this happened three and change billion years ago, and as we are all frequently told, the Earth is only 6000 years old, so ... not to worry.
Reminder: 100°C is the boiling point of water. 212°F if you're keeping score in Fahrenheit.