Which of These Best Describes the Comparison of Observed Changes

Multiple Choice

Which of these best describes the comparison of observed changes in CO2 production and IPCC model scenarios of expected CO₂ production?

A) Model scenarios predicted CO₂ production about right.
B) Model scenarios overestimated CO₂ production.
C) Observed CO₂production has exceeded the worst model scenarios.
D) Observed CO₂ production rose but has recently declined below IPCC model scenarios.
E) CO₂ production matches the middle range of model scenarios