Planet Hunter and W.W.3

Suppose our country discovers the new "earth". What are some negative impact on the old one? People will ignore Global Warning because they have a new "house" to live. Ruining the old one would not be a big deal. Nations will fight each other to control plan. The U.S propose that the new earth's territories should be divided correspondingly to the previous one. None of the countries agree. The U.N is torn apart. World War 3 takes place.