I think climate change is both real and human caused. Climate change could come from eruptions of volcanoes, agriculture, industrial processes, etc. Not every reason for climate change is around humans. Most industrial processes do release a lot of greenhouse gases though which trap heat into our Earth. Volcanoes when they erupt release carbon dioxide and ash and that goes into the air and adds up to the amount already there. Agriculture could leads to emissions of methane from animals digestion but methane can also be released by decaying of matter. Like I said most causes are human based but there are some natural based that can cause climate change too. It all goes back around to greenhouse gases. Rain can also be a good reason for climate change because when rain will evaporate it turns into water vapor which is a greenhouse gas as well.

Geologic studies indicate that volcanoes only influence weather, not climate. The biggest influence on record I am aware of is the Krakatoa volcano that changed weather to some degree for two years! That was a very powerful volcano; usually volcanic eruptions have only very temporary effects. As for agriculture and industrial processes, humans are behind both of these, so this would be an argument FOR human influence in climate change.