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.

Example Input: Global warming is already making it worse.
Example Output: agrees

Example Input: Global warming will harm Americans.
Example Output: agrees

Example Input: According to a NASA study in 2015, the land ice is actually growing in Antarctica.
Example Output:
neutral