Which type of environmental events is categorized as "man-made"?

The category of "man-made" environmental events specifically includes occurrences that are directly a result of human activity or negligence. Oil spills and pollution are prime examples because they stem from industrial processes, transportation accidents, and the improper disposal of waste. These events significantly impact ecosystems, human health, and the environment.

In contrast, floods, hurricanes, earthquakes, volcanic eruptions, tsunamis, and forest fires are primarily natural disasters arising from natural processes of the Earth. While human activities can influence the severity or frequency of some natural events (such as climate change contributing to hurricanes), the events themselves are not directly caused by human actions. Therefore, the correct answer highlights the distinct nature of man-made disasters versus naturally occurring ones, centering on the direct human impact on the environment.