"man-made activities" is correct and usable in written English.
You can use it when referring to activities that are conducted by humans, as opposed to naturally occurring activities. For example, "The environmental impact of man-made activities is contributing to climate change."
Xinjiang province is one of the unhealthiest region in China due to natural as well as man-made activities.
In the recent decades, effects of blast loads on natural and man-made structures have gained considerable attention due to increase in threat from various man-made activities.
The current emissions of CO2 to the atmosphere through man-made activities are outlined and the options for recycling CO2 for some useful purpose, as distinct from simply storing or disposing it in an environmentally-benign manner, are discussed.
Such warming, driven to largely by man-made activities, is causing Arctic sea ice to melt at a rate of 12% a decade in summer.
Therefore, the Merrimack River paleo-delta, and similar offshore submerged features elsewhere, serve not only as research opportunities into early human migration and settlement, but are also storehouses of climate and environmental data, which merit special recognition and protection from environmental and man-made activities that may impact or disturb these intact submerged landscapes.
The Management Branch investigates how man-made activities like urbanization, agricultural practices, and wastewater impact Canadian water supplies.
It is designed specifically to study electromagnetic effects connected with seismic and man-made activity.
This paper present a procedure whose results allow to give a simple answer to the above question, central in earthquake engineering and, in a broader context, in any man-made activity.
The climate's been going up and down, but the real question which I think everyone's trying to address is, is this influenced by man-made activity in recent years and James [Delingpole] is actually correct.
At a 2017 packed town hall meeting in Chico, LaMalfa told the crowd that he does not "buy the idea that man-made activity is responsible" for climate change.
Ben Carson, another potential nominee, has said climate change is "not a big deal", while Florida senator Marco Rubio said last year that scientists have taken "a handful of decades of research and say that this is now evidence of a longer-term trend that's directly and almost solely attributable to man-made activity.
