There are a few tabs out for this, but none in the open D6 tuning 
that M Ward plays in, so here's my take on it. I'm just doing the 
chords, you can have fun figuring out the fingerpicking yourself!

In Open D6 tuning (DADF#BE)

D=054530 or 004030
A=002320
A7=002120
G=555585 (or 555555 for the more colorful G6)
G6=020100
Gm6=010100 - this one may not be 100% right

Verse 1:
       D
This river that we ride has always been alive
                                       A         D
Oh my soul one hundred million years
       D
This river that we ride will roll on when we die
                                      A         D
Oh my soul one hundred million years


Chorus:
         G                   D
And this love, this light, between you and I
    G6                   Gm6                 A7
Is older than that burning ball of fire up in the sky
                                        D
And the gale that fills our sail


Verse:
              D                           
And the lights that shine tonight have always been alive
                                       A          D
Oh my soul one hundred million years
               D                    
Yeah the lights that shine tonight will burn on when we die
                                       A          D
Oh my soul one hundred million years


Chorus x2:
              G                         D
And this love, this light, between you and I
    G6                   Gm6                 A7
Is older than that burning ball of fire up in the sky
                                         D
And the gale that fills our sail

END