All man-made alterations to the landscape - forests, prairies, countryside, suburban, and urban areas change the local climate - surface and air temperature, range of max and minimum daily temperatures, humidity, clouds, hydrology, and vegetation.
One thing that mankind does not significantly cause is supposed catastrophic, anthropogenic, planet-wide global warming. The sun is by far the main source of warming planet Earth, not infrared excited CO2 molecules at tiny concentrations.
