The most important thing is to preserve the world we live in. Unless people understand and learn about our world, habitats, and animals, they won't understand that if we don't protect those habitats, we'll eventually destroy ourselves.
Questions have also arisen about AIDS being transmitted to hemophiliacs via blood transfusions.
The threat of terrorism is great and with today's porous borders, someone could bring a biological weapon into our country or sneak a dirty bomb across unmanned portions of our borders.

