TASK 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.
PROBLEM: There could be as little as 30 years of burning fossil fuels before the threshold is reached.

SOLUTION: neutral

PROBLEM: Global warming is already making it worse.

SOLUTION: agrees

PROBLEM: Human activities are not a major cause of global warming.

SOLUTION:
disagrees