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: High-speed rail
 Argument: High speed rail is a great tourist attraction.
in favor

Topic: AIG bonuses
 Argument: Government should have regulated bonuses, not tax them.
against

Topic: Algae biofuel
 Argument: Algae biofuel is carbon neutral; only emits C02 that it absorbs.

in favor