Well it's pretty much just A-Bm-D-A the whole song, but I have it typed out for you :)

Intro:
                         A
Lemme see you put your hearts up,yeah 
                         Bm
Lemme see you put your hearts up, yeah
       D                                            A
If we give a little love, maybe we can change the world,

Verse 1:
 A
You think you're so small, like you're itty bitty,
 Bm
Just one match in the lights of the city,
  D
Walkin' by strangers on the side of the street,
          A
like a quarter in a cup'll get 'em up on their feet like,
      A
You think you're never gonna make your mark,
     Bm
sit back and watch the world while it falls apart like,
 D                          A
out of sight, out of mind like, It's just a waste of time,

Chorus:
  A                  Bm
Hey Yeah Yeah Yeah, Hey Yeah Yeah,
 D                                                  A
If We Give A Little Love, Maybe We Can Change The World
 A
I Said Hey Yeah Yeah Yeah,
 Bm              D
Hey Yeah Yeah, Sing it if you with me,
                           A
All you boys and all you girls,
                           A
Let me see you put your hearts up, yeah,
                          Bm
Let me see you put your hearts up, yeah,
        D                                          A
If We Give A Little Love Maybe We Can Change The World


A - Bm - D - C 

Don't let them bring you down-down down-down,