This seems a bit myopic. The Earth receives less than one hundred billionth of the energy being dumped into space by the sun. Of the incredibly small portion the Earth does receive, we barely use any of it. There is plenty of energy available. We just have to harness it.
Don't get into victim-blaming. Where bicycling is prioritized in the development planning (e.g. Netherlands, where it's also quite flat), people bike all the time.
There are powerful entities who throw their weight around in both policy and propaganda to promote the wasteful forms of transportation.