Climate Change: The State of the Science : Hearing Before the Committee on Science, House of Representatives, One Hundred Seventh Congress, First Session, March 14, 2001, Volume 4U.S. Government Printing Office, 2001 - 163 pages |
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Page 9
... figure shows a new data set gained over the last 5 years of surface temperatures in the northern hemisphere for the past 1,000 years . The earlier data are from ice cores and tree rings and other historical measurements . And that ...
... figure shows a new data set gained over the last 5 years of surface temperatures in the northern hemisphere for the past 1,000 years . The earlier data are from ice cores and tree rings and other historical measurements . And that ...
Page 10
... figure is what climate models will yield if that change were due only to natural variation . The right - hand figure is the simulation that would occur if greenhouse gases are in- cluded . And , as you can see , the fit of the last 100 ...
... figure is what climate models will yield if that change were due only to natural variation . The right - hand figure is the simulation that would occur if greenhouse gases are in- cluded . And , as you can see , the fit of the last 100 ...
Page 19
... figure in tomorrow's pre- dictions . Mr. EHLERS . Thank you , Mr. Chairman . Chairman BOEHLERT . The gentleman's time has expired . Mr. Udall . Mr. UDALL . Thank you , Mr. Chairman . And I want to welcome the Panel and particularly note ...
... figure in tomorrow's pre- dictions . Mr. EHLERS . Thank you , Mr. Chairman . Chairman BOEHLERT . The gentleman's time has expired . Mr. Udall . Mr. UDALL . Thank you , Mr. Chairman . And I want to welcome the Panel and particularly note ...
Page 22
... figures is that over the 850 years of this millen- nium at the beginning , temperature varied on the order of a of a degree Celsius . Mr. ROHRABACHER . Uh - huh . Dr. ALBRITTON . The first 400 years were relatively warm com- pared to ...
... figures is that over the 850 years of this millen- nium at the beginning , temperature varied on the order of a of a degree Celsius . Mr. ROHRABACHER . Uh - huh . Dr. ALBRITTON . The first 400 years were relatively warm com- pared to ...
Page 43
... Figures a - b , we see the concentration of carbon dioxide over the last 400,000 years . The key feature to note is that ... Figure e , covers the period of 600,000,000 years ago to the present with a focus on the longer term . Dinosaurs ...
... Figures a - b , we see the concentration of carbon dioxide over the last 400,000 years . The key feature to note is that ... Figure e , covers the period of 600,000,000 years ago to the present with a focus on the longer term . Dinosaurs ...
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Common terms and phrases
Academy of Sciences aerosols agencies ALBRITTON anthropogenic areas carbon cycle carbon dioxide Chairman BOEHLERT challenge Change Research Program climate change climate models climate sensitivity climate system climate variability cloud feedback CO₂ Committee on Global concentrations decade decision Earth system ecosystems El Niño emissions energy environment fossil fuel global average Global Change Research global climate Global Environmental Change global warming greenhouse gases human activities important improved increase Institute integrated interactions IPCC IPCC WGI THIRD issue Kennel land long-term measurements National Academy National Research Council natural Niño observing system ocean ozone past physical ppmv prediction problem processes progress projected question radiative forcing response ROHRABACHER scale scenarios Science of Regional scientists sea level simulations spatial strategy SUMMARY FOR POLICYMAKERS surface temperature sustained Technology terrestrial Thank thermohaline circulation THIRD ASSESSMENT REPORT tion Total Award uncertainties understanding WGI THIRD ASSESSMENT
Popular passages
Page 140 - the balance of evidence suggests a discernible human influence on global climate' [5], and was sufficiently confident by the time of the Third Assessment Report to conclude that 'there is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities...
Page 129 - describe and understand the interactive physical, chemical, and biological processes that regulate the total earth system, the unique environment that it provides for life, the changes that are occurring in this system, and the manner in which they are influenced by human actions.
Page 152 - Bl storyline and scenario family describes a convergent world with the same low population growth as in the Al storyline, but with rapid changes in economic structures toward a service and information economy, with reductions in material intensity, and the introduction of clean and resource-efficient technologies.
Page 137 - In the mid- and high latitudes of the Northern Hemisphere over the latter half of the 20th century, it is likely7 that there has been a 2 to 4% increase in the frequency of heavy precipitation events.
Page 141 - In the light of new evidence and taking into account the remaining uncertainties, most of the observed warming over the last 50 years is likely to have been due to the increase in greenhouse gas concentrations.
Page 55 - Hemisphere indicate that the increase in temperature in the 20th century is likely to have been the largest of any century during the past 1000 years. It is also likely that, in the Northern Hemisphere, the 1990s was the warmest decade and 1998 the warmest year.
Page 137 - It is very likely7 that precipitation has increased by 0.5 to l% per decade in the 20th century over most mid- and high latitudes of the Northern Hemisphere continents, and it is...
Page 65 - The size of this warming is broadly consistent with predictions of climate models, but it is also of the same magnitude as natural climate variability. Thus the observed increase could be largely due to this natural variability; alternatively this variability and other human factors could have offset a still larger human-induced greenhouse warming...
Page 56 - ... about 10% in the extent of snow cover since the late 1960s, and ground-based observations show that there is very likely to have been a reduction of about two weeks in the annual duration of lake and river ice cover in the mid- and high latitudes of the northern hemisphere, over the 20th century.
Page 126 - Agenda 21 is a comprehensive plan of action to be taken globally, nationally and locally by...