Meet the women who won't have babies - because they're not eco friendly

But the very thought makes her shudder with horror.

Because when Toni terminated her pregnancy, she did so in the firm belief she was helping to save the planet.

Desperate measures: Toni Vernelli was steralised at age 27 to reduce her carbon footprint

Incredibly, so determined was she that the terrible "mistake" of pregnancy should never happen again, that she begged the doctor who performed the abortion to sterilise her at the same time.

He refused, but Toni - who works for an environmental charity - "relentlessly hunted down a doctor who would perform the irreversible surgery.

Finally, eight years ago, Toni got her way.

At the age of 27 this young woman at the height of her reproductive years was sterilised to "protect the planet".

Incredibly, instead of mourning the loss of a family that never was, her boyfriend (now husband) presented her with a congratulations card.

While some might think it strange to celebrate the reversal of nature and denial of motherhood, Toni relishes her decision with an almost religious zeal.

"Having children is selfish. It's all about maintaining your genetic line at the expense of the planet," says Toni, 35.

"Every person who is born uses more food, more water, more land, more fossil fuels, more trees and produces more rubbish, more pollution, more greenhouse gases, and adds to the problem of over-population."

While most parents view their children as the ultimate miracle of nature, Toni seems to see them as a sinister threat to the future.

It's an extreme stance which one might imagine is born from an unhappy childhood or an upbringing among parents who share similar, strong beliefs.

But nothing in Toni's safe, middle- class upbringing gave any clues as to the views which would shape her adult life. The eldest of three daughters, she enjoyed a loving, close-knit family life.