Why human caused disasters is a problem

Human-Caused disasters have an element of human intent, negligence, or error involving a failure of a man-made system, as opposed to natural disasters resulting from natural hazards. Such man-made disasters are crime, arson, civil disorder, terrorism, war, biological/chemical threat, cyber-attacks, etc.

A: become a alien but sound like a human

Ibelieve the topic sentence is [1] keeping my mind on my writing is not easy when i stay at my grandfather's ocean-side cottage. hope this : )