We're still struggling to reach traction with our # of questions/day. And I'm really concerned that this is going to end up closed, like the Astronomy/Economics SEs..
I have an idea: how about importing some of the best Earth Science questions from Reddit AskScience?
They have a lot of good questions there that could turn into good SE questions. I'm not advocating importing all of them. Just looking at the list and using our best judgment to select which ones to use.