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: Global warming grows phytoplankton; growing more is reckless.
against

Topic: Comprehensive Nuclear-Test-Ban Treaty
 Argument: Nuclear test ban reduces risks of nuclear fallout.
in favor

Topic: Instant replay in baseball
 Argument: Instant replay ends umpire shame of making decisive, bad calls.

in favor