This holiday season the Guardian will be running a global appeal to encourage our readers to give to a number of charities providing relief for refugees across the world. The refugee crisis has been one of the most defining and devastating stories of 2015 and we feel that it is important to lend our support and stand together with those who so desperately need our help.

There are currently more than 20 million people seeking sanctuary from oppression and conflict across the globe; many of whom - men, women and children alike - have fled the devastating war in Syria. The plight of refugees can often seem far removed from our daily lives, and geographic, cultural and language differences mean all too often we overlook those in need. But it is vital we do not close our hearts, or lose sight of the essential human response, or ignore the needs of some of the world’s most desperate people.

At Guardian US, we will be supporting the #GivingTuesday movement by donating all advertising space on our site on Tuesday December 1st to charities who are supporting individuals and families fleeing from conflicts in their home countries.

We have chosen six brilliant charities - Doctors without Borders, International Rescue Committee, Migrant Offshore Aid Station, Mercy Corps, Oxfam America and Refugees International - to receive free advertising space on Our aim is to highlight the important work they are doing and to encourage our readers to donate to those in need.

We hope our efforts will encourage people to stand together with refugees across the globe and to donate generously to those who are working tirelessly to alleviate suffering.