The 'I Wish I Was a Punk Rocker (With Flowers in My Hair)' singer has unveiled the title track of her fourth album, which was released last month.
The video opens with a clip from Martin Luther King Jr's famous 1963 'I Have a Dream' speech, while the song includes the lyrics: "While bloody war will tear us apart, yeah/ We all share our tears/ We all have one heart."
Thom said: "The human race is hanging on by a thread and we have to do everything we can to unite and save it. I have a voice and I feel like I should use it.
"After my friend [drummer] Tal [Bergman] and I had recorded the vast majority of the song I sat back in the producer's chair and realised that this song could really reach out and touch people."
She continued: "Sometimes you don't write a song, the song writes itself. This song came from the pit of my stomach and the deepest depths of my soul.
"I feel so desperately sad at the news I watch every day that I must stand up and say something and I don't give a f**k if I get stick for it.
"Someone needs to stand up and tell it like it is for the millions of people who do not have the priceless gift of freedom of speech."
Thom added: "I want to strike a chord in the hearts of millions. When I have an opportunity to say something that can resonate with people and light a fire in their hearts, then I embrace it despite the consequences. We are all at the end of the day just Flesh and Blood."
Thom brings her 'Flesh and Blood' tour to the UK this November.