The combustion of fossil fuels have been identified as a major factor in the increase of global warming.
Carbon Dioxide level has risen. It has risen from 290 parts per million to 370 ppm in the past century
When precipitation was low, snowfall was high. When Precipitation was high snowfall was high
It was colder and there was more rainfall when our grandpa and great-grandpa were alive. This can be proven by the graph that shows there was more rain and snowfall during their time.