bird flu or any number of deadly diseases could cause problems. doctors are trying to prevent an outbreak. >> over the last three decades there have been about 30 newly emerging diseases that have the potential to be pan democratics. if we do nothing, it's not a matter of if there will be a global pandemic. it's just a matter of when and which virus and how bad. >> the world changes around us at increasing speed. we cause a hot of that change. migrating to cities, stripping the earth of its resources and altaring prime evil jungle. >> we are seeing whole entire ecologies, that which you can see with your eye and that which you can only see with a mooirk scope, sun one system after another completely reshaped.