So while the ensemble mean shows a nearly symmetric temperature response to positive and negative CO2 emissions, the quick growth of the ensemble spread implies that any scenario that invokes almost any amount of net negative emissions adds substantial uncertainty to the global temperature response.

Any deviation from the dashed line during the blue phase in the figure above implies a different response to negative than positive emissions. What's most interesting to me is how quickly the ensemble spread grows under negative emissions and then stays throughout the negative emissions phase.

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