http://books.google.com/books?id=oUrLkuQsyPAC&printsec=frontcover&source=gbs_navlinks_s#v=onepage&q=&f=falseread from 107 to the end
nothing
if the ecosystem is upset,the earth will have natural disasters
The balance between gravity and pressure can be upset if two nebulas collide. It can also be upset if a nearby star explodes.
The balance between gravity and pressure can be upset if two nebulas collide. It can also be upset if a nearby star explodes.
The balance between gravity and pressure can be upset if two nebulas collide. It can also be upset if a nearby star explodes.
Natural catastrophes
people will increase so that there will be overcrowding.
Germany
using antibiotics
Nationalism
Nationalism