You will be given a definition of a task first, then some input of the task.
You will be given a topic and an argument. Decide the argument's stance towards that topic. The argument's stance is in favor or against the topic. If the argument supports that topic, answer with "in favor"; otherwise, if the argument opposes the topic, answer with "against".

topic: Geoengineering, solar shading
argument: Solar shading may warm the tropopause and lower stratosphere.
Output:
against