Flags are generally designed to stand out against the background, so I am not convinced that using red on the martian flag is such a good idea. Which is also why there are few green flags in Europe, and also why the white flag of House Stark does not make any sense :-)
The majority of the flag is white though, and only a small portion is red. So I wouldn't consider this much of an issue. My understanding is that sandstorms are likely to reduce visibility at great distances anyways.
Although the idea of colonising Mars is something really exciting, I doubt we will be able to pull it off any time soon. There are many much more hospitable places that we haven't yet "colonised", despite a long history of human presence -- compared to Mars surface, Antarctica and Greenland interior are practically a paradise.
Did the authors of this website ever heard of the male sign (♂) which is already for millennia the symbol for Mars? Or is this supposed to be an upgrade?
