>A lot of hard work, non vehicular labor, local sourcing, and luck, providence, perseverance, and serendipity.

none of this will make any difference.

>How do you suppose humans did it prior to the invention of the coal mine and oil drill?

well, we didn't use fossil fuels, and there were far fewer of us on the planet. With 8billion fossil fuel addicted people, half of whom are yet to be raised from poverty, riding your bike will make you feel better but wont make any difference.