Victor and other critics, however, say that as the target becomes effectively unachievable, it threatens the relevance of the process it's intended to catalyze. Though some models show that the target can still be met, those make "heroic assumptions"�immediate global cooperation, for instance, or the sudden, wide availability of new technologies.

"Pretending that they are chasing this unattainable goal has also allowed governments to ignore the need for massive adaptation to climate change," Victor and Kennel write.

Victor also points out that average global surface temperatures doesn't fully represent the changing global climate. Although the increase in average surface temperature has stalled over the past 16 years, average temperatures in the deep ocean�where most of the extra heat in the climate system is stored�has continued to rise.

"We think it's an error to boil it all down to a single goal, given how complex the climate system is," he says.

Actions by the United States and the International community have been insufficient to adapt to the challenges associated with projected climate change. Strengthening resilience to climate impacts already locked into the system is critical, but this will reduce long-term risk only if improvements in resilience are accompanied by actionable agreements on ways to stabilize climate.

... And in case your young'uns want to keep track of Santa Claus/Father Christmas/whomever, on Christmas Eve ...