Career
Karl wrote:
Internationally, the Intergovernmental Panel on Climate Change (IPCC), under the auspices of the United Nations (United Nations), World Meteorological Organization (World Meteorological Organization), and the United Nations Environment Program (United Nations Environment Programme), is the most senior and authoritative body providing scientific advice to global policy makers.
Karl was the lead on a study on the existence of this supposed hiatus in global warming. In their report published in the American Association for the Advancement of Science (American Association for the Advancement of Science) Science journal in June 2015—based on the updated National Oceanographic and Atmospheric Administration dataset— they found no indication of a slowdown even in the previous years.
This analysis incorporated the latest homogenization corrections for known biases in ocean temperature measurements, and new land temperature data.
Scientists working on other datasets welcomed this study, though the view was expressed at the time that the short term warming trend had been slower than in previous periods of the same length. Editor Journal of Climate
Associate Editor Climatic Change
National Research Council
Climate Research Committee (1991–present)
Panel on EOSDIS (1992-1994)
Panel on Policy Implications of Greenhouse Warming (1990–1992)
Intergovernmental Panel on Climate Change: Lead Author 1995, 1992, 1990
Public Affairs: Numerous news media interviews, testimony to United States. Congress and briefings to cabinet-level officials and Vice President of the United States.
Karl, T.R., R.W. Knight, and B. Baker.
2000. The record breaking global temperatures of 1997 and 1998: Evidence for an increase in the rate of global warming.
Geophysical Research Letters 27(March 1):719-722. (press release).