The action/1D campaign is part of action/2015, a global citizens' movement which wants 2015 to be the year when the world can set the agenda to end extreme poverty, tackle inequality and climate change.
Margherita Watt, director of creative and digital at Save the Children, part of action/2015, said: "One Direction has done an incredible thing by mobilising their huge fanbase to speak up about the issues that really matter to them in this momentous year.
"We hope that by speaking out together, their voices will be heard and in a way that world leaders cannot ignore. This is the generation that has the power to tackle the most important issues of our time and change the world for better."
Last week One Direction confirmed they will be taking a break next year but have insisted they are not breaking up.