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". 

Q: Topic: Carbon emissions trading
 Argument: Emissions trading encourages investments in best technologies.

A: in favor
****
Q: Topic: Privatizing social security
 Argument: Costly privatization of Soc Sec would dampen econ growth.

A: against
****
Q: Topic: Cellulosic ethanol
 Argument: Cellulosic ethanol can be 0 emissions.

A:
in favor
****