Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 

Topic: Underground nuclear waste storage
 Argument: Underground storage will never overcome societal fears.
against

Topic: Banning vuvuzela horns at the 2010 World Cup
 Argument: Guests at World Cup should embrace S. African vuvuzela tradition.
against

Topic: Hybrid vehicles
 Argument: Hybrids increase efficiency by shutting engines down while idling.

in favor