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
 Argument: Natural gas vehicles reduce emissions, fight global warming.

SOLUTION: in favor

PROBLEM: Topic: Vehicle fuel economy standards
 Argument: CAFE standards have strong history of reducing US emissions.

SOLUTION: in favor

PROBLEM: Topic: Geoengineering, solar shading
 Argument: Solar shading might cool tropics, but not high latitudes and poles.

SOLUTION:
against