Yes and no. My family’s personal carbon footprint is negligible. And it’s less than average because we reduce it intentionally. Let’s say for example that we reduce our footprint by 40% (I don’t know what the number is, but I wouldn’t be surprised if it were around this). Big deal - 40% of an average family’s greenhouse emissions is still 40% of bugger-all.

But now imagine three million families doing this. 40% of three million average families suddenly is a significant number.