While the Earth's atmosphere has seen higher levels of carbon dioxide than it does now, as well as higher temperatures and far greater sea levels, those instances were due to
natural drivers of climate change, such as periodic variations in the planet's orbit and in solar energy output.
This brochure briefly discusses the human and
natural drivers of climate change, direct observations of recent climate change, projections of future changes in climate, and climate change and desertification.
When models only include
natural drivers of climate change, such as natural variability and volcanic eruptions, they can not reproduce the recent increase in temperature.
Solar irradiance variations are sometimes assumed to be the most likely
natural driver of climate change.
Not exact matches
In the spring
of 2014, Koonin's drafting committee produced a statement that attributed equal weight to human influences and
natural variability as a
driver of climate change, according to a source who declined to be named.
«This is the strongest evidence from fossils that the main
driver of this extinction event was the after - effects
of a huge asteroid impact, rather than a slower decline caused by
natural changes to the
climate or by severe volcanism stressing global environments.»
The model also accounted for
natural drivers of change, including the direct influence
of increased carbon dioxide on ocean - carbon uptake and the indirect effect that a
changing climate has on the physical state
of the ocean and its relationship to atmospheric carbon dioxide.
Climate Change 2007 The Physical Science Basis, the report of Working Group I, «assesses the current scientific knowledge of the natural and human drivers of climate change, observed changes in climate, the ability of science to attribute changes to different causes, and projections for future climate change.
Climate Change 2007 The Physical Science Basis, the report of Working Group I, «assesses the current scientific knowledge of the natural and human drivers of climate change, observed changes in climate, the ability of science to attribute changes to different causes, and projections for future climate change.&
Change 2007 The Physical Science Basis, the report
of Working Group I, «assesses the current scientific knowledge
of the
natural and human
drivers of climate change, observed changes in climate, the ability of science to attribute changes to different causes, and projections for future climate change.
climate change, observed changes in climate, the ability of science to attribute changes to different causes, and projections for future climate change.&
change, observed
changes in
climate, the ability of science to attribute changes to different causes, and projections for future climate change.
climate, the ability
of science to attribute
changes to different causes, and projections for future
climate change.
climate change.&
change.»
NEWS:
Climate change rather than
natural causes is the main
driver of state's glacier loss, which is set to speed up, US scientists say
The session explores regional integration
of records and dynamic modeling to: (1) understand better the nature
of climate - human - ecosystem interactions; (2) quantify the roles
of different
natural and anthropogenic
drivers in forcing environmental
change; (3) examine the feedbacks between anthropogenic activity and the
natural system and; (4) provide integrated datasets for model development and data - model comparisons.
The new directive is the culmination
of an extensive interagency review process undertaken in response to rapid
changes taking place in the Arctic, the principal
drivers of which are
climate change, increasing human presence in the region, and the growing demand for Arctic energy deposits and other
natural resources.
And when all the
natural and human - induced
climate drivers are compared to one another, the dramatic accumulation
of carbon from human sources is by far the largest
climate change driver over the past half century.
However there are other first order
drivers of climate including
natural ones like solar variation and human driven ones like land use
change, aerosols and soot.
Scientists have examined several important strands
of evidence about the LIA, including the activity
of the sun,
of volcanoes, and ocean heat circulation, principle
drivers of natural climate change.
Secondly, city governments are the
drivers for addressing risks through ensuring basic services, which are the first line
of defense against the impacts
of climate change and
natural hazards.
«The additional burden
of CO2 added to the atmosphere by human activities... leads to the current «perturbed» global carbon cycle... These perturbations to the
natural carbon cycle are the dominant
driver of climate change because
of their persistent effect on the atmosphere.»
«This is an immense reserve
of natural gas, but it is 70 % CO2,» or carbon dioxide, the main
driver of climate change.
Your side, the side that says human emitted CO2 is the primary
driver of climate change, and which (hubristically) says that
natural variation can not explain all the warming we've seen, can not explain why the warming has apparently stopped for almost two decades.
Those
changes are not easy to measure or reproduce with
climate models, and some researchers think
natural variability or
changes in the tropics are more important
drivers of weather extremes in the mid-latitudes.
In the spring
of 2014, Koonin's drafting committee produced a statement that attributed equal weight to human influences and
natural variability as a
driver of climate change, according to a source who declined to be named.
As Skeptical Science readers are undoubtely well aware, the impact
of natural climate drivers has been very thoroughly studied, and they simply can not account for the observed global warming or
climate change, especially over the past 50 - 65 years (Figure 1).
Hence,
changes in temperature due to
climate change are expected to be one
of the important
drivers of change in
natural and managed systems.
Uncertainty in
natural climate drivers, for example how much solar output will
change over this century, also affects the accuracy
of projections.
His research concerns
natural and human
drivers of climate change, linkages between air quality and
climate change, and the interface between
climate change science and policy.
Friends
of Science Society says
natural factors like solar cycles and ocean fluctuations are the main
drivers of climate change.»
It is a bit surprising that scientists attempt to write a supposedly «serious» paper estimating degree
of the
climate's
natural against the anthropogenic
change with this state
of knowledge: The nature and origin
of the AMO is uncertain, and it remains unknown whether it represents a persistent periodic
driver in the
climate system, or merely a transient feature.
Indeed, the American Association
of Petroleum Geologists (AAPG), an international organisation
of more than 30,000 Earth scientists, has formally rejected the view that anthropogenic factors are the main
drivers of global warming, stressing: «The earth's
climate is constantly
changing owing to
natural variability in earth processes.
NEWS:
Climate change rather than
natural causes is the main
driver of state's glacier loss, which is set to speed up, US scientists say
From the chart, it is clear there are very abrupt
changes in acceleration and deceleration
of temperatures, which strongly suggest powerful
natural climate factors are in the
driver's seat, not human CO2 emissions.
But you also stray beyond this @ 87 where you talk
of the question
of identifying the different
drivers of climate change — human activities &
natural cycles.
Astronomical phenomena are obvious
natural factors to consider when trying to understand
climate, particularly the brightness
of the sun and details
of Earth's orbit because those seem to have been major
drivers of the ice ages and other
climate changes before the rise
of industrial civilization.
The study shows that there are four regions
of the US where human - caused
climate change will ultimately overtake
natural variability as the main
driver of heat waves in the coming decades.