I have picked these chords out by ear.,. It sounds fine on my guitar! 
Hope you like it :) Love Pentatonix SO SO SO much! Here's an original: 

Verse: 

Am                              G Am 
My heart was blowing in the hurricanes, 
                              F C          F G 
My heart was blowing in your love, in your love 
Am                          G Am 
My heart was flying in tornadoes, 
                            F C           F G 
My heart was flying in your love, in your love 

Bridge:  

            F                      Am 
You see, I tried. Baby, oh, did I try? 
            C 
The more I get closer to you 
             G 
The more I know you just won't do 
             F                     C E 
You see, I tried, girl, you know I tried (oh, I tried) 

Chorus:  

                        F  C G Am 
But you're a natural disaster,  
                    F   C   G 
You're a natural disaster 
          Am 
Oh whoa oh 

(The rest of the song carries on in the same pattern.) 

My mind was frozen in the blizzards, 
My mind was frozen in your love, in your love 
My mind was burnin' in the (wild fire), 
My mind was burnin' in your love, in your love 

You see, I tried. Baby, you know I tried 
But, girl, I hate myself when you're near 
Honey, get up and get out of here 
You see, I tried. Darling, did I try? (oh, I tried) 

But you're a natural disaster, you're a natural disaster 

My body was shaking in your earthquakes, 
You had my body quaking (in your love) from your love (oh, in your love) 
My life was drowning in tsunamis, 
You pulled me under baby (in your love) with your love, (oh, in your love) with your love 

I'm telling you I tried. Did I ever try? 
But in the end I'm broken and hurt 
Now I know it'd never work 
You see, I tried. Honey, oh, did I try? (oh I tried) 

My soul–it died in Armageddon, 
My soul–it died from your love, from your love 
You're bringin' these plagues on me, 
You brought me to my knees from your love, from your love 

You see, I tried. Lord, did I try? 
But, girl, you're rainin' hell on my earth, 
I pray to heaven if I'm real worth 
You see, I tried. Baby, did I try? (oh, I tried) 

But you're a natural disaster, you're a natural disaster, 
You're a natural disaster, you're a natural disaster 
You're a natural disaster...