This is my first tab so please comment with any suggestions. The other version did not seem quite right so I tabbed it myself. This tab covers the intro and the chorus. However, the chords for the rest of the song include Am, C, and G. Standard Tuning Capo on the 4th fret
e|---------------------------------------------------------|
B|-------1--------------1----------------------------------|
G|---------2---2--------0-----------0----------------------|
D|-----2-----2--------2---2---------0----------------------|
A|----0--------------3------------2---2--------------------|
E|-------------------------------3-------------------------|
Am C G trees, oh trees Am C G do you remember me? Am C G trees, oh trees Am C G do you remember me? Am C G from before Am C G and birds, oh birds Am C G can you recall my songs? Am C G from before Am C G fire, oh fire Am C G i can still feel your warmth Am C G like before
Source: http://www.guitartabs.cc/tabs/i/i_am_oak/on_trees_and_birds_and_fire_tab.html