What surface area is inhabited by humans?

According to Matt Rosenberg, 90% of the population occupies 3% of the land. Land covers 29% of the globe. .03 x .29 = .0087 = .87% Let's call it 1%. Therefore, if Mr. Rosenberg is correct with his data, I believe it's very safe to say that less than 2% of the Earth's surface is inhabited by humans.