The phrase "activities of mankind" refers to the things that people do or the actions that humans engage in. It includes all the actions, behaviors, and tasks that people carry out. Full definition
And this asinine concept that we «are at war with evil» is what causes most of the unthinkable activities of mankind. (religion.blogs.cnn.com)
The scientists have found the culprit — drum roll — no, it's not the wanton activity of mankind, rather it's the Atlantic AMO ocean cycle, which fluctuates with a period of 60 years. (notrickszone.com)
In mentioning the activities of mankind before the flood, Jesus is not condemning them per se, for from them half the people are taken to the kingdom. (faith.org.uk)