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: Geoengineering, iron fertilization of algae blooms
 Argument: Best practices in iron fertilization can ensure effectiveness.
in favor

Topic: Instant replay in baseball
 Argument: Instant replay would better legitimize MLB and game outcomes.
in favor

Topic: Natural gas
 Argument: Natural gas drilling leaves a large environmental footprint.

against

