Change in Climate

I believe that global climate change is real, but is not a result of humans. Many people that believe humans have caused global climate change also believe that there was once an Ice Age. Well, if there was an Ice Age before, then that means that all that ice melted. Wouldn’t that be Global Climate Change? And then, that would prove that Global Climate Change is a natural occurrence not a human caused occurrence. It just doesn’t make sense how people can claim there was an Ice Age and then say that Global Climate Change is caused by humans.