The suspect in Saturday’s killing of ten people at a Buffalo supermarket allegedly wrote a document endorsing the Great Replacement Theory. It’s a racist far-right conspiracy theory that falsely states there’s a secret plan to replace white people through increased immigration and other means. In the United States some politicians and mainstream media figures like Tucker Carlson of Fox News are accused of pushing a version of the theory when they insist Democratic Party immigration policies have the same aim. In Europe too, fears that white, Christian culture is being undermined have been stoked by far-right politicians across the continent. So how has Great Replacement Theory evolved? Is the basic philosophy behind it going mainstream? And what can and should be done to address the fears of people concerned about demographic change?

Ritula Shah is joined by a panel of expert guests.