Instructions: 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.
Input: The research is the first to quantify how air pollution in the United States is affected by Chinaâs production of goods for export and by global consumer demand for those goods.
Output:
neutral