Recent data and research supports the importance of natural climate variability
and calls into question the conclusion that humans are the dominant cause of recent climate change:
•The hiatus in global warming since 1998
•Reduced estimates of the sensitivity of climate to carbon dioxide
•Climate models predict much more warming than has been observed in the early 21st century
We have made some questionable choices in defining the problem of climate change and its solution:
•The definition of ‘dangerous’ climate change is ambiguous, and hypothesized catastrophic tipping points
are regarded as very or extremely unlikely in the 21st century
.
•Efforts to link dangerous impacts of extreme weather events to human-caused warming are misleading and unsupported by evidence.
•Climate change is a ‘wicked problem’ and ill-suited to a ‘command and control’ solution
•It has been estimated that the U.S. INDC of 28% emissions reduction will prevent 0.03 °C in warming by 2100.