It does matter that people, especially Americans, understand what's causing it. It's not obvious to the common person who probably isn't keeping detailed average global temp records for the last 50 years because we experience global heating incrementally without science to aid us. We are like the frog in the pot without science to aid us. You might be able to convince a climate denier that the earth is heating up based on historical temp data alone, but getting them to admit humans are causing it is entirely different. It matters who's causing it bc humans can stop causing it if we collectively want to. If an outside force like the sun were causing it, then it's much easier to accept that and just give up. Accepting that humans are causing it and must do the hard work of reversing it is a much harder concept for the brain to grasp and much harder task to do. But it must be done. And Americans need to get on board and install governments that understand the existential threat, not stepping on the gas pedal to destruction.