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".
One example: topic: Nuclear energy
argument: Nuclear energy can reduce materials available for weapons-use.
Solution is here: in favor
Explanation: The given argument is in favor of nuclear energy.

Now, solve this: topic: Hydroelectric dams
argument: Dams last over a hundred years; good return on investment
Solution:
in favor