Every time we step we kill creatures, micro organisms.
Every time we flush the toilet we raise the water level a fraction which may harm wildlife.
Computers, phones, modems laptops are made using animal carcass derived adhesives- stearates. Same with car tyres, bike tyres, microchips, TVs. Even if you use public transport you are supporting the use of animal by products in lubricants , fabrics and floorings.
I don't think anyone can truly call themselves vegan unless they are off grid.