David Filo — American Businessman born on April 20, 1966,

David Filo is an American businessman and the co-founder of Yahoo! with Jerry Yang. His Filo Server Program, written in the C programming language, was the server-side software used to dynamically serve variable web pages, called Filo Server Pages, on visits to early versions of the Yahoo! web site... (wikipedia)

Fundamentally, if you look at where the environmental issues are coming from, it's all because of humans and our impact on the environment, so while it's true that one individual is not going to sufficiently fix the environment, it is a necessary thing.
Open is something, I think, that will continue to drive a lot of innovation.
What's been important with Flickr is the community that's been there from the beginning and the serious photographers that are there creating and sharing great content. If we lose that at some point then I think we have potential issues, but so far we've been able to do a really good job of maintaining that.
Hire passionate employees.
Hack Days were initially started for Yahoo employees.