I help to make this planet a better place to live.

Carrying a bag on a beach walk and filling it turns forty minutes into fifty. The beach is not saved. Roughly eleven kilos of it are better than they were.

Planetary scale is the enemy of most people's willingness to do anything, because every individual act, measured against the whole, rounds to zero.

That arithmetic is correct and completely useless.

The other arithmetic is that the beach at the end of your walk is a real place used by real people, and it is now cleaner. Systems change because millions do the locally sensible thing, which never feels like enough while you are doing it.