TASK DEFINITION: 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". 
PROBLEM: Topic: Carbon emissions trading
 Argument: US cap-and-trade in sulfur dioxidew was succesful.

SOLUTION: in favor

PROBLEM: Topic: Reforestation as a solution to global warming
 Argument: Reforestation can result in release of greenhouse gas Methane.

SOLUTION: against

PROBLEM: Topic: Is Wikipedia valuable?
 Argument: Wikipedia lacks the important process of peer-review.

SOLUTION:
against