That’s why we also need to reduce our use of pretty much everything. We can never reach zero fossil fuel used, unless we start by reducing the amount of stuff we buy/use, starting with things that currently use fossil fuels: cars, shipping, flights, plastics and so on.

Then we could use renewable energies only or nuclear only or a mix of both to power what is truly necessary for our lives.

It depend on your morphology I guess: for me below 15km rides, I can wear jeans and it’s fine, but above that it starts to be painful. When I’m touring I really enjoy having my cycling pant, even a cheap one does the job perfectly for me. But again, I have a quite large distance between my ischium bones, so the same may not apply to everyone.