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.
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.
Online advertising is display plus search.
Open is something, I think, that will continue to drive a lot of innovation.
Hire passionate employees.