Global warming is the increased warming of Earth's climate system that has been seen from the pre-industrial period (between 1850 and 1900) as a result of anthropogenic activities, principally carbon fuels combustion, which increases heat-trapping greenhouse gas atmospheric CO2.
The correct answer is 3. Movement of glaciers.
This is the correct answer because this is the foremost factor that affected the way people in the northern hemisphere lived during the last ice age.
Any geologic time during which large ice sheets cover extensive plots of the territory is described as an ice age, also known as a glacial age. Large-scale glaciation can endure millions of years, substantially altering the surface features of entire continents. Throughout Earth's history, there have been a number of major ice ages.
To know more about the standard of living in the ice age, refer to the link below:
https://brainly.com/question/696793
