The zero-carbon activity paradox

It's April and boy is it wet outside. Which is worse: riding a bicycle in the winter and getting covered in salt or riding in the rain with toxic runoff from buildings spraying you in the face? It's time for more green roofs, people. Alas, let's find a new indoor hobby.
For the price of slightly more than a movie ticket, I bought a 4x4 Rubik's Cube. Over the years, the 2x2 and the classic 3x3 have offered me hours of entertainment and I trust that the 4x4 will present a greater challenge and countless hours of low carbon entertainment.
I learned the 2x2 and 3x3 in years prior to my web addiction. Now with the aid of websites and YouTube tutorials, this may only detract from the challenge and my toiling hours. A true geek would never stop after 4x4. The shopkeeper at the game store asked me if I wanted to spring for the 5x5. He added, "the 5x5 can be done with all of the algorithms from the 3x3 and the 4x4. Do you know the Rubik's Parity Theory?"
Ok..., time to leave.
It's not exactly zero-carbon, but neither is walking or bicycling which both require shoes that were made in China. The Rubik's cube is also made in China. It's made almost entirely of petrochemicals, but unless I develop a hatred for the cube, I can take pleasure in the fact it won't go leachating in a landfill any time soon. Surely, kWh's will be needed to power my laptop, my lamp, as I solve the cube. I may decide to play some intellectually stimulating music, perhaps classical!