Careful that no one else sees what he's up to (because heaven forbid people get the idea he cares), Adachi gets himself a pair of glasses so he can read properly and hits the library. He's looking for something that'll tell him how to actually talk to the World Tree directly.

'Cause if it's the World Tree that's dying, and it's struggling to communicate with them and tell them why, then the obvious answer is to talk to it and find out what they can do to help, right?