Weather is a discreet event, Climate is just a trend line fitted to a long run average of those discreet measurements. If you observe an upward or downward trend in some measurable phenomena, you try to find out why.
Weather and climate science is hard because there are so many variables that have to be accounted for in predictive models and algorithms. I don't know that you can say climate change is purely anthropogenic, but there's a lot of correlation between the industrialization of the world and the population explosion of the last 150+ years. Then again, we could just be seeing the effects of the end of the "Little Ice-Age." Either way, if climate change is real then I'm less worried about what caused it and more worried about how do we adapt to its effects.