Not exact matches
As the graph below from Spracklen's News and Views article shows, the balance between warming (red shading) and cooling (blue shading) have kept the country's
contribution to
human -
caused climate change pegged at about 10 % in recent decades, despite soaring fossil fuel emissions.
Scientifically, the meteorologists, climatologists, and atmospheric physicists, who were responsible for «discovering» the
human contribution to the terrestrial greenhouse effect, have been the most consistent champions of its importance, while the solar physics community, and especially those interested in solar - terrestrial relations, have increasingly stressed the possible importance of the long - term variations of the solar constant as the chief
cause of
climate change.
Nevertheless, it should be stated that since CO2 is a GH, and since most if not all of its increase is
human -
caused, there must be some minor
human contribution to
climate change.
While I reject most apocalyptic scenarios as unfounded or unduly speculative, I am convinced that the
human contribution to
climate change will
cause or exacerbate significant problems in at least some parts of the world.
We not only agree, but have dozens of examples of how great American bird conservation projects make considerable, sometimes unexpected
contributions to other important
causes including amphibian conservation,
human health, food safety,
climate change, water conservation, and home energy savings.
While it is generally accepted that the observed reduction of the Northern Hemisphere spring snow cover extent (SCE) is linked to warming of the
climate system
caused by
human induced greenhouse gas emissions, it has been difficult to robustly quantify the anthropogenic
contribution to the observed
change.
Some are specific about quantifying the percentage of
human contribution, others just say «
humans are
causing climate change» without specific quantification.
E.g., research assumes greenhouse gas emissions
cause warming without explicitly stating
humans are the
cause»... carbon sequestration in soil is important for mitigating global
climate change» (4a) No position Does not address or mention the
cause of global warming (4b) Uncertain Expresses position that
human's role on recent global warming is uncertain / undefined «While the extent of
human - induced global warming is inconclusive...» (5) Implicit rejection Implies
humans have had a minimal impact on global warming without saying so explicitly E.g., proposing a natural mechanism is the main
cause of global warming»... anywhere from a major portion to all of the warming of the 20th century could plausibly result from natural
causes according to these results» (6) Explicit rejection without quantification Explicitly minimizes or rejects that
humans are
causing global warming»... the global temperature record provides little support for the catastrophic view of the greenhouse effect» (7) Explicit rejection with quantification Explicitly states that
humans are
causing less than half of global warming «The
human contribution to the CO2 content in the atmosphere and the increase in temperature is negligible in comparison with other sources of carbon dioxide emission»»
(Geoengineering is popular among right - leaning think tanks; as are the views — which Thernstrom does not share — that
climate change isn't
caused by
human activities, or that our
contribution is overhyped and may not be the primary
cause.)
Therefore, knowledge on the Time of Emergence (ToE), or the years that the
human contributions to
climate change will become more important than natural variability in
causing heat waves, is crucial for better mitigation and adaptation efforts.