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: Vehicle fuel economy standards
 Argument: CAFE standards have strong history of reducing US emissions.
in favor

Topic: Mine Ban Treaty (Ottawa Treaty)
 Argument: Geneva Conventions regulates use of landmines; ban is excessive.
against

Topic: Merit pay for teachers
 Argument: Teacher merit is too hard to measure for merit-pay to be fair.

against