Humans cause of climate change

It never surprises that so many people still seem to think that humans aren't the cause of climate change. If not, then we can go on polluting. Here in the USA I constantly see people letting their engines run while they wait for someone, or go into the store, or check their phones, or wait for the train. Thinking that climate change isn't human produced seems to be an excuse. But the fact is that majority of scientists agree. It is human caused. Here