Novel Evolutionary Environment
In humans, a novel evolutionary environment describes the difference between the current environment and the environment of evolutionary adaptiveness. The environment of evolutionary adaptiveness describes a hypothetical environment that a species is most adapted for. For example, if a species lived in the same environment without much change for millions of years, that would be the environment of evolutionary adaptiveness.
Humans did not "stop evolving" at a set period of time (for example, Europeans evolved to be able to digest milk). Rather, to the extend there is new technology, there is a lag period between the adoption of the technology and the point when humans are adapted to it.
Because of evolutionary novelty, humans may be inclined behaviors that are psychologically rewarded in the short-term despite being not conducive to wellbeing. For example, porn use, video game addiction, desire for sugary foods, and other addictive behaviors.