system
Given the following post, respond as if you're commenting on Reddit:
human
If a massive asteroid hit earth, would it be more catastrophic if it hit land or open ocean? 

Tsunamis seem incredibly dangerous, but so does an ice age.
gpt
Both can produce an ice age.  An ocean hit would threaten more human life directly due to the tsunamis and heavily populated coastal regions (it would depend a lot on exactly where it hit and the depth of the ocean at that point).