Originally Posted by
rodsky
Hmmm...
The surface area of the planet earth is 510,065,600 square kilometers. Out of this area, land area is about 148,300,000 sq km, or about 30% of total surface area, the area covered by water (i.e. oceans, seas, lakes, rivers) are 361,800,000 sq km, or about 70% of the total surface area. Out of the 148,300,000 sq km, less than 1/20th is considered to be "populated by mankind". Which means, only about 7,415,000 square kilometers are occupied by man, and roughly also the same size where land pollution (the basis of our argument, since the Mars landers have only landed on a solid surface) can occur. This is just 1/68th of the entire surface area of the world, that we "land pollute" .
Now...the surface area of Mars is about 150,000,000 square kilometers, amazingly almost roughly the same amount of surface that the land area of Earth minus the seas. And now, count how many landers have landed on Mars, and measure the amount of space they occupy in that 150,000,000 square kilometers. Divide 150,000,000 square kilometers by that number, and then tell me if those landers' presence are a significant "land pollution" for Mars, please.
-RODION