Lehner recently published another study looking at the overlay of population
on warming projections.
Not exact matches
Global
warming projections show that by 2100, Earth will be 4 degrees C
warmer on average.
The long - term
warming over the 21st century, however, is strongly influenced by the future rate of emissions, and the
projections cover a wide variety of scenarios, ranging from very rapid to more modest economic growth and from more to less dependence
on fossil fuels.
The findings were not a total surprise, with future
projections showing that even with moderate climate
warming, air temperatures over the higher altitudes increase even more than at sea level, and that,
on average, fewer winter storm systems will impact the state.
Checking 20 years worth of
projections shows that the Intergovernmental Panel
on Climate Change has consistently underestimated the pace and impacts of global
warming
On March 31 Muller testified in front of Congress and confirmed what mainstream climate scientists had been saying: Earth is
warming in line with the
projections of climate models.
The IPCC chapter
on long - term climate change
projections that Wehner was a lead author
on concluded that a
warming world will cause some areas to be drier and others to see more rainfall, snow, and storms.
«This quantitative attribution of human and natural climate influences
on the IPWP expansion increases our confidence in the understanding of the causes of past changes as well as for
projections of future changes under further greenhouse
warming,» commented Seung - Ki Min, a professor with POSTECH's School of Environmental Science and Engineering.
«The information will be a critical complement to future long - term
projections of sea level rise, which depend
on melting ice and
warming oceans.»
In the midst of an unseasonably
warm winter in the Pacific Northwest, a comparison of four publicly available climate
projections has shown broad agreement that the region will become considerably
warmer in the next century if greenhouse gas concentrations in the atmosphere rise to the highest levels projected in the the Intergovernmental Panel
on Climate Change (IPCC) «business - as - usual» scenario.
Decisions made today are made in the context of confident
projections of future
warming with continued emissions, but clearly there is more to do to better characterize the human and economic consequences of delaying action
on climate change and how to frame these issues in the context of other concerns.
I must also announce again, like a broken record, that running averages for March 2006 Canadian high Arctic are totally
warm: +5 to 10 degrees C
warmer, more again like a Polar model
projection 20 years from now due to Polar Amplification as
on a previous post
on RC.
Bracegirdle, T. J. & Stephenson, D. B.
On the robustness of emergent constraints used in multimodel climate change
projections of Arctic
warming.
Understanding how well climate models represent these processes will help reduce uncertainties in the model
projections of the effects of global
warming on the world's water cycle.
Despite these challenges, many future
projections based
on high - resolution models suggest that anthropogenic
warming may cause tropical storms globally to be more intense
on average (with intensity increases of 2 — 11 % by 2100).
Climate model
projections show a
warmer Montana in the future, with mixed changes in precipitation, more extreme events, and mixed certainty
on upcoming drought.
Leung emphasized the estimate's conservativeness, noting that the climate
projections of
warming devised by the U.S. Department of Energy and the National Center for Atmospheric Research are
on the low end compared to most other models.
The report also notes that global
warming continues to track early IPCC
projections based
on greenhouse gas increases.
The report also noted that global
warming continues to track early IPCC
projections based
on greenhouse gas increases.
James Screen, a climate researcher at the University of Exeter, said in an email that while the findings are consistent with model
projections and look more robust than the studies linking
warming to the larger fluctuations of the jet stream, «I'd be cautious pinning the blame
on Arctic
warming.»
Differences in
projections of
warming by the end of the century appear to be related to assumptions made
on emission trajectories and the ambitiousness of climate policies beyond 2030 rather than differences in methodology or climate modeling.
This isn't news to top climate scientists around the world (see Hadley Center: «Catastrophic» 5 — 7 °C
warming by 2100
on current emissions path) or even to top climate scientists in this country (see US Geological Survey stunner: Sea - level rise in 2100 will likely «substantially exceed» IPCC
projections, SW faces «permanent drying») and certainly not to people who follow the scientific literature, like Climate Progress readers (see Study: Water - vapor feedback is «strong and positive,» so we face «
warming of several degrees Celsius»).
He bases his hugely bullish
projection on a $ 6 trillion market value for gold GCG8, +0.31 % explaining that investors appear to be
warming up to the idea that bitcoin is more portable and divisible than the precious metal.
I fell in love with the place immediately for reasons far too numerous to name, but what left the biggest impression
on me was the rides: The pitch black skies, French architecture, and
warm faux - night air of Pirates of the Caribbean, the ghostly dancing
projections in the Haunted Mansion, and the psychedelic thrill of speeding along the stars in Space Mountain (still my favorite).
http://www.nasa.gov/vision/earth/lookingatearth/quikscat-20071001.html In other words, we read in the press that this melt was caused by global
warming effects exceeding
projections, but it would be more factual to say we are seeing natural effects superimposed
on global
warming effects over a pretty short time frame over which
projections aren't specifically made.
On the other hand, if much of that
warming was due to pseudo oscillations not included in the models (AO, NAO, AMO, ENSO, PDO, etc) then their
projections may be less valid.
Two recent reviews of research
on warming and the oceans in Nature Reports / Climate Change have stressed just how unlikely those high - end sea
projections are.
However, this in itself is not enough to define what level of
warming is «dangerous,» especially since the
projections of actual impacts for any level of
warming are highly uncertain, and depend
on further factors such as how quickly these levels are reached (so how long ecosystems and society have had to respond), and what other changes are associated with them (eg: carbon dioxide concentration, since this affects plant photosynthesis and water use efficiency, and ocean acidification).
I must also announce again, like a broken record, that running averages for March 2006 Canadian high Arctic are totally
warm: +5 to 10 degrees C
warmer, more again like a Polar model
projection 20 years from now due to Polar Amplification as
on a previous post
on RC.
Although it is too soon to know whether overall
projections for Arctic
warming should be changed, the recent temperatures add to uncertainty and raises the possibility of knock -
on effects accelerating climate change.
A section of the piece
on an emerging disconnect between climate model
projections of
warming and observations makes it clear that climate modelers have plenty of work to do.
Do you think that in the same way that the Solanki et al paper
on solar sunspot reconstructions had a specific statement that their results did not contradict ideas of strong greenhouse
warming in recent decades, this (the fact that climate sensitivity
projections are not best estimates of possible future actual temperature increases) should be clearly noted in media releases put out by scientists when reporting climate sensitivity studies?
page 30: «Current carbon dioxide emissions are, in fact, above the highest emissions scenario developed by the Intergovernmental Panel
on Climate Change (IPCC), implying that if we stay the current course, we're heading for even larger
warming than the highest
projections from the IPCC.»
Fourteen research teams studying the impacts of
warming on the Arctic Ocean have issued independent
projections of how the sea ice will behave this summer, and 11 of them foresee an ice retreat at least as extraordinary as last year's or even more dramatic.
This is precisely the problem with comparing short observational time series and model
projections that was exemplified in the January 10 blog post («A Spot Check
on Global
Warming») by your colleague John Tierney.
How big an effect do you feel that this is having
on mainsteam climate science's «global
warming»
projections?
Given the enormous consequences and irreversible losses from global
warming should the worst
projections play out, the time for improving the flow of information
on this subject is clearly now.
He went
on to discuss how the original paper's sea - rise
projection was, in his view, flawed, but also how the way it was described distracted from overall confidence about rising seas in a
warming world.
The
projections are based
on a midrange scenario for a rise in the heat - trapping emissions linked to global
warming.
The release describes new research finding that global
warming from the buildup of greenhouse gases will be
on the low end of the persistently wide spread of
projections by other research groups.
Tornadoes: There was a spate of Instanet attacks
on Senator John Kerry yesterday for discussing
projections of stronger storms in a
warming world in the context of the catastrophic tornado strikes.
The theory of anthropogenic global
warming rests solely
on computer - model
projections into the future.
«Future
projections based
on theory and high - resolution dynamical models consistently suggest that greenhouse
warming will cause the globally averaged intensity of tropical cyclones to shift towards stronger storms,» Knutson et al. (2010); Grinsted et al. (2013) projected «a twofold to sevenfold increase in the frequency of Katrina magnitude events for a 1 °C rise in global temperature.»
Note that the «long, fat tail» of high - end
warming projections in AR4 is absent from
projections based
on more recent science.
In summer and autumn the CSIRO
projections were for smaller decreases in rainfall than in winter and spring, but the observed change was a substantial decrease: in fact, as large a decrease between the successive 11 - year periods as CSIRO projected
on the high global
warming scenario over the 40 - year period from 1990 to 2030.
In the second image, we show
projections based
on 2 °C (3.6 °F) of
warming from carbon pollution.
Projections by Global
Warming Science, SPOT
ON ACCURACY: 1.
Their strategy relied
on the idea that the models that are going to be the most skillful in their
projections of future
warming should also be the most skillful in other contexts, such as simulating the recent past.
«Future generations will wonder in bemused amazement that the early 21st century's developed world went into hysterical panic over a globally averaged temperature increase of a few tenths of a degree, and,
on the basis of gross exaggerations of highly uncertain computer
projections combined into implausible chains of inference, proceeded to contemplate a roll - back of the industrial age,» Lindzen was quoted, offering praise for Christopher C. Horner's Politically Incorrect Guide to Global
Warming and Environmentalism.
The Intergovernmental Panel
on Climate Change (IPCC) failed to prove human CO2 is causing global
warming as evidenced by their incorrect
projections.