artificial; man-made; human-caused
Describes something caused or created by humans, often with a negative nuance when referring to errors or disasters. Used in formal and news contexts.
This lake was artificially created.
事故の原因は人為的ミスだった。
The cause of the accident was human error.
This accident was caused by human error.
Human error was the cause of the accident.
It's difficult to artificially bring about changes in temperature.