The green thing if you actualy think about it when you escort the bot through container city as security you open a container and you find. The Bio weapon. Thats more than likely the green glowy thing.
I gotta tell you something, everytime we have opened that container I've been dead or at the start :l
Never seen the thing.. But I guess you're right, it must be a bio-weapon
Further proving that The Resistance is [censored] up in the head and all that, just listen to some audio logs, the loading screen speeches and some of the cutscenes.. Seriously :l