The equality gap between genders would take an estimated 100 years to close, according to the World Economic Forum.

Romilly Greenhill, UK director of the One Campaign, said: “Girls’ education is essential in the fight to end extreme poverty, and ensuring every girl gets the chance to learn is the key to unlocking their huge potential.

“Until we’re able to break down the barriers holding girls and women back on a global level, extreme poverty and gender inequality will continue to exist.”

You can sign the open letter here.

Images: Getty / Rex Features

Why Oprah and Meryl Streep have penned an open letter on gender equality to world leaders