Assistant Professor Trude Storelvmo presents research which suggests that the cooling effect of aerosols may mask up to 0.5 degrees of warming. The implications are significant, as efforts to abate air pollution that health officials attribute to millions of deaths each year around the global will exacerbate warming trends and suggest that equilibrium climate sensitivity is at the higher end of ranges reported in the most recent IPCC Assessment Report.
formerly “Climate Science” this has been updated in recognition of the fact that ALL of our articles, events, etc. involve climate sciience. ”Climate change” is intended to suggest changing elements of the climate: e.g., shifts in global oceanic and atmospheric circulation and ensuing changes to temperature, precipitation, groundwater levels, saltwater intrusion.
Kevin Trenbeth, from the National Center for Atmospheric Research (NCAR), addresses a recent and recurring question about a conjectured pause in the rise of global surface temperatures during YCEI’s workshop on “Uncertainty in Climate Change: A Conversation with Climate Scientists and Economists”
Klaus Keller is an associate professor in the Department of Geosciences at Penn State University and an adjunct professor in the Department of Engineering and Public Policy at Carnegie Mellon University.
In a simple but important analysis, Mora and colleagues analyzed climate projections to identify when future warming will exceed the climate envelope of the past 150 years. They used multiple models (39) and seven climate variables (such as near-surface temperature …
Fran Ulmer reminds people that “Antarctica has penguins. The Arctic has people.” Ms. Ulmer was a University of Alaska Chancellor and Lieutenant Governor of Alaska from 1994-2002. She talks about the effects of climate change in Alaska where average seasonal temperatures have already increased by 4 degrees in summer and 7 degrees in winter. Her talk is wonderful for anyone who forgets how very different the situation is at the Earth’s poles: Antarctica is uninhabited land surrounded by an ocean, whereas the Arctic is an ocean surrounded by 8 nations.
William Nordhaus is the Sterling Professor of Economics at Yale University and author of over 20 books, including the recently published “The Climate Casino: Risk, Uncertainty, and Economics for a Warming World.” His DICE model is one of the first and still most widely utilized integrated assessment models for considering the relationships between climate change, energy consumption and economic impacts. What is really relevant to the discussion of uncertainty, says Professor Nordhaus, is an understanding of statistics, which is the subject of his talk.
Chris Forest, Pennsylvania State University, discusses estimations of climate sensitivity and testing of models against what is known about the past thousand years.
Stephen Schwarz, Brookhaven National Laboratory, delivers a talk entitled, “Empirical Determination of Earth’s Climate Sensitivity and Implications of Present Uncertainties”, at the YCEI conference “Uncertainty in Climate Change: A Conversation with Climate Scientists and Economists”.
Martin Weitzman of Harvard University begins his discussion by reviewing the most recent IPCC Summary Report and the language they use for describing the likelihood of various climate sensitivity scenarios. He relates that language and those likelihoods to the various probability distributions calculated by climate and economic modelers.
Gary Yohe of Wesleyan University explains how the value of information regarding projections of climate sensitivity depends on:
1. what the decisions are to be made about and for whom, 2. the character of the decision space (states of nature, irreversibility, persistence, etc.), 3. decisions based on the range of “states of nature” and “their distributions”, 4. decision makers prior assumptions about those distributions, 5. decision makers’ attitudes (averstion) towards risk, 6. timing of the decision.