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 4
... direct observations of climate data and on such indirect ob- servations of temperature as tree rings , corals , and ice cores . The IPCC also concluded that " there is new and stronger evidence that most of the warming observed over the ...
... direct observations of climate data and on such indirect ob- servations of temperature as tree rings , corals , and ice cores . The IPCC also concluded that " there is new and stronger evidence that most of the warming observed over the ...
Page 9
... direct from thermometers , over- lap for the 100 - year period where the two data sets exist . Second point , these direct observations show that the last 150 years have been remarkably different than the previous 850 years . There are ...
... direct from thermometers , over- lap for the 100 - year period where the two data sets exist . Second point , these direct observations show that the last 150 years have been remarkably different than the previous 850 years . There are ...
Page 10
... direct observations that are con- sistent with the world getting warmer . The question is , of course , is this a natural variation , or is this something that involves green- house gases ? And that brings me to the second point from ...
... direct observations that are con- sistent with the world getting warmer . The question is , of course , is this a natural variation , or is this something that involves green- house gases ? And that brings me to the second point from ...
Page 17
... direct it at myself and my peers . And that is , we need to be clearer about what we know , what we think we know , and what we don't know . Unfortunately , I find that myself and my peers and then , consequently , others , confuse what ...
... direct it at myself and my peers . And that is , we need to be clearer about what we know , what we think we know , and what we don't know . Unfortunately , I find that myself and my peers and then , consequently , others , confuse what ...
Page 18
... direct measurement . That is a very high certainty that we can make that statement . It is also a fairly high certainty - not quite as high , but fairly high - that that is going to have a climatic effect , because you are trapping ...
... direct measurement . That is a very high certainty that we can make that statement . It is also a fairly high certainty - not quite as high , but fairly high - that that is going to have a climatic effect , because you are trapping ...
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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...