The phrase "human influence" refers to the impact that people have on something or someone. It implies that humans are causing changes or affecting the behavior, environment, or outcome of a situation. Full definition
So, in effect, to pin down the role of human influence on climate in the winter that has just ended, we need to roll the weather dice again thousands of times. (climateprediction.net)
It concluded that the global average temperatures seen in recent years would be highly unlikely in a world without human influence on the climate. (carbonbrief.org)
They compared the probability of the extreme summer of 2013 in the natural - only experiments with the ones that had human influences in them. (scientificamerican.com)