...that is the question.
I think I know the answer to the first, but it raises another issue:
i) public transport is presumably low-carbon, not no-carbon. However, this raises a wider issue - offsetting. I think it would be justifiable for those who use public transport and cars to claim birds as zero-carbon finds if they offset their emissions (and can prove it). Thoughts please.
ii) if I visit relatives in Bedford, who live a few hundred yards from Fenlake Meadows, and I walk to the site from my relatives' house, is this zero-carbon? Would I need to get to Bedford by zero-carbon means, or just from my relatives (if I stayed overnight, for example)? Thoughts please.