I'm afraid those scientists are 155 years late with their findings. Humans have adapted to their environment as explained by Charles Darwin in 1859. We have adapted to live on Earth, not in space or on the bottom of the oceans. This should not come as a surprise to anyone in 2014. To overcome this we have to gradually start living higher up, and perhaps in just a few hundred thousdands years our decendants will take their first steps in the vacuum of space, breathing sunlight and radiation instead of air.
Or we could just adapt the envioronment in the space ship / space habitat. Probably a lot easier..