I applied through an employee referral. The process took 1 day. I interviewed at The Nature Conservancy (Philadelphia, PA) in Jan 2015
Interview
Intern was really informal. Consisted of a Skype call with Senior Advisor who just asked me questions about my interests as well as logistics of the internship. They needed an all-around support intern so there really weren't many requirements. This interview came about through a family-friend referral, so I didn't formally apply.
Interview questions [1]
Question 1
-What are you interested in doing?
-Are you interested in the work we do? Why?