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: Natural gas vehicles
 Argument: Odorless natural gas can escape detection risking fire/explosion.

SOLUTION: against

PROBLEM: Topic: Libertarianism
 Argument: Free-market economics is the ideal form of (non)governance.

SOLUTION: in favor

PROBLEM: Topic: Cellulosic ethanol
 Argument: Energy security: cellulosic ethanol reduces dependence on foreign oil.

SOLUTION:
in favor