Kelly and I saw those people today! Except they said something along the lines of ...
Greenpeace: You seem like someone who cares about the earth.
Me: Oh, yeah? (I think.)
Greenpeace: Come talk to us for a bit.
Me: Sorry. Not today.
I don't exactly remember what was said after that initial comment, but I know that my response was a lot lamer than yours. I was thinking of just saying "not really", but wasn't brave enough to spit it out.