You will be given a definition of a task first, then some input of the task.
Read the passage and find if the passage agrees, disagrees, or has a neutral stance on whether Global warming is caused by human activities. Answer only with keyword (a) agrees - if passage agrees with the target (b) disagrees - if passage disagrees with the target (c) neutral - if the given passage neither agrees nor disagrees with the target. You don't need to use external knowledge in this task, and you have to answer based on the given passage.

A large-scale transition to renewable sources of energy would require five to 20 times more land than prior studies have shown, and expanding wind farms would actually warm the continental U.S. more than carbon emissions in the short term.
Output:
neutral