A 2,500-mile radius in Asia contains half the world's population (2017)
Total world landmass: 57,510,000 miles squared.https://en.wikipedia.org/wiki/List_of_countries_and_dependen...2500 miles * 2500 miles * pi = 19,630,000 miles squaredSo that area represents about (19.63 / 57.51 ) 34% of the total world landmass. So 50% of humans live in 34% of the landmass. But harsh and relatively uninhabitable lands make up a large portion of the earth's landmass( antarctica - 5,400,000, siberia - 5,100,000, canada - 3,511,023, australia - 2,947,336, , greenland - 836,330) = 17.8 million square miles.So the habitable areas are 57.51 - 17.8 = 39.71 million miles squared.So that circle represents ( 19.63 / 39.71 ) 49.4% of the habitable land.So in the end, about 50% of the world population lives in about 50% of the world's habitable land.Astounding huh? It's amazing what some math and common sense and understanding of geography takes away from a clickbait article based on a reddit post.As others have noted, that area is also primed for human habitation due to tons of fresh water rivers flowing from the tibetan plateau and rich fertile land along with year-round planting seasons due to its proximity to the equator.