Bjork claims surgery has given her a deeper voice.

The enigmatic singer had a polyp removed from her vocal cords in November 2012, but rather than limit her abilities she believes the procedure has had a huge impact on her voice because it has extended her range.

She revealed: ''Since the operation, I have some of the high notes better than I have had for a while, but also I've got some deep notes that I didn't have before. And I haven't used them.''

The pop star - who released her ninth studio album 'Vulnicura' earlier this year - is so pleased with her improved voice she is tempted to record a new EP solely to show it off.

She continued: ''I'd like maybe to do an EP just with the deep notes.''

However, the 49-year-old musician admitted she currently has more pressing concerns outside of her music career as she is horrified about her home nation of Iceland and its plans to build dams through the countryside.

She told London's Time Out magazine: ''Right now my heart is very concerned about the Iceland highlands. The government has decided it's going to make dams all over the highlands and so the biggest untouched area in Europe is going to go away in the space of three or four years.''

And the plans, along with books by author Timothy Morton, have inspired Bjork to think about the state of the planet and how humans interact with nature and technology.

Speaking about the books, she said: ''They're really interesting. His angle is that the apocalypse has already happened and we are now in the aftermath, so there's hope for us. And I was like: I really agree with that. So let's do something about it. One solution is to change how we relate to technology and how we relate to nature. There's still a way.''