Definition: 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.

Positive Example 1 -
Input: Most global warming is natural and even if there had been no Industrial Revolution current global temperatures would be almost exactly the same as they are now.
Output: disagrees

Positive Example 2 -
Input: All fossil fuel use needs to be regulated to reduce global warming.
Output: agrees

Negative Example 1 -
Input: We can not live on fossil fuel forever.
Output: disagrees

Negative Example 2 -
Input: More warming leads to more fires, which release more carbon, which causes more warming, and so on.
Output: I don't agree

Now complete the following example -
Input: The low-carbon electricity grid alone will cost $5.4 trillion.
Output: 


Answer: neutral