Sentences with phrase «climate over thousands of years»

The results also show these ancient lakes actually have a net cooling effect on climate over thousands of years.

If you agree with the paleo proxy records that, according to Bob's link demonstrate a tiny variation in climate over thousands of years, you are effectively agreeing with the statement above.

Not exact matches

In the speech the leader of the June 4, 1979, uprising decried the spate of corruption that has characterised the political climate over the past few years describing it as a thousand times more than what prevailed prior to the June 4 uprising.

The leader of the June 4 1979 uprising, former President Flt Lt Jerry John Rawlings has decried the spate of corruption that has characterised the political climate over the past few years describing it as a thousand times more than what prevailed prior to the June 4 uprising.

Sedimentary rock layers provide a more compressed view of climate, as each layer of sediment is made over a period of hundreds of thousands to millions of years.

«There must have been regional climate and chemical conditions that varied in time and space,» he says, adding that this would occur as the tilt of Mars's spin axis changed over tens of thousands of years, a wobble caused by the lack of a massive moon to stabilise the planet.

The simulator lets scientists project how changing climate conditions will impact forests over thousands of years.

Stalagmites, which crystallize from water dropping onto the floors of caves, millimeter by millimeter, over thousands of years, leave behind a record of climate change encased in stone.

Beyond climate change, ancient DNA provides a window into the past to view evolution and ecology over hundreds of thousands of years.

He and climate scientist Johannes Feldmann, also of the Potsdam climate center, wanted to examine how the destabilization would progress in the longer term, over hundreds to thousands of years.

Earth's climate naturally varies between times of warming and periods of extreme cooling (ice ages) over thousands of years.

This in turn, over many thousands of years, triggered natural climate change, amplified by CH4 releases characterised by a ∂ 13C deficiency.

School climate is «something that educators have explicitly been researching for over 100 years,» notes Cohen, «and SEL is something that I would suggest is several thousands of years old.

But you can look at past climate records, and see no sign, over many thousands of years, that solar variations have had effects of anything like the size needed to cancel out the expected effects of increased greenhouse gas levels in the atmosphere over the next few decades.

MalcolmT says: «Nick @ 20 Previous climate changes occurred over a time scale of hundreds or thousands of years.

I don't think anyone denies that the sun matters for climate, but the question is whether the variability of the sun in recent history has had the impact that we project from greenhouse gases over the next 100 — and there, I think, a majority of your «AGW» ers» would think the evidence suggests that changes in human forcing will likely be several times (at least) larger than any solar variability we've seen in a thousand years or more.

Unprecedented amounts of greenhouse gases (at least over the last few hundred thousand years) continue to accumulate in the atmosphere and the global climate (land surface, ocean, glaciers, stratosphere) continues to respond as predicted by theory and models.

Without our use of fossil fuels, we should be descending into another glacial maximum — albeit slowly, over tens of thousands of years (the pace of natural global climate change in the Pleistocene).

Yes, there can be natural climate changes over thousands or millions of years that are large compared to what we are experiencing now.

It features some of the most dramatic and rapid climate shifts in Earth's history, as well as tenacious scientists braving the hostile ice and snows of Greenland and Antarctica for years on end to bring home that most precious material: kilometre - long cores of ancient ice, dating back over a hundred thousand years.

I simply can't see how a detached observer could possibly believe hundereds of thousands of man - years, numerous sattelites, and billions of dollars have been spent looking at our climate over the last few decades but for some reason nobody spotted that it was all based on the rings of 5 fossilised trees.

I sincerely hope that you are not serious in maintaining the following: The peak warming is linearly proportional to the cumulative carbon emitted It doesn't matter much how rapidly the carbon is emitted The warming you get when you stop emitting carbon is what you are stuck with for the next thousand years The climate recovers only slightly over the next ten thousand years At the mid-range of IPCC climate sensitivity, a trillion tonnes cumulative carbon gives you about 2C global mean warming above the pre-industrial temperature.

a) atmospheric CO2 from human activity is a major bause of observed warming in the 1980's and 1990's, c) that warming is overstated due to a number of factors including solar effects and measurement skew d) the data going back 150 years is of little reliability because it is clustered so heavily in northeast america and western europe rather than being global e) the global climate has been significantly shifting over the last thousand years, over the last ten thousand years, and over the last hundred thousand years; atmospheric CO2 levels did not drive those changes, and some of them were rapid.

Climatologists are puzzled by the unusual stability of the climate over the past 10,000 years, compared to the previous hundreds of thousands of years.

Trude Storelvmo of Yale University and her colleagues did not use climate models to find out the answer, but they based their calculations on temperature and solar radiation records taken from more than thousands of global measurement sites over the course of 46 years.

If that makes the science unsettled when compared to the billions of data points accumulated by thousands of real climate scientists working over fifty years, then nothing will ever be settled enough for you.

In the case of climate change, those measurements after measurements by thousands of scientists for over fifty years are adding up to an extremely compelling and robust argument because they all pretty much agree with each other: we can send people to the moon, and our excess CO2 is changing the climate.

Over hundreds or thousands of years, civilization and the biosphere have adapted and evolved to match a climate not very different from that of recent times.

Long - term climate variability is the range of temperatures and weather patterns experienced by the Earth over a scale of thousands of years.

A fragmentation of the cultural landscapes in the arid and semi-arid lands of Mongolia has increased vulnerability and reduced the adaptive capacities to climate variability of traditional pastoral systems, which have evolved over thousands of years.

This in turn, over many thousands of years, triggered natural climate change, amplified by CH4 releases characterised by a ˆ «13C deficiency.

To answer this question properly it would be necessary to view climate cycles over hundreds of thousands of years.

An ice core - formed by compaction of previous snowfalls - constitutes a historical record of the local climate and atmosphere stretching back over thousands of years.

In the ensuing report we present a meta - analysis of the peer - reviewed scientific literature, examining how the productivities of Earth's plants have responded to the 20th and now 21st century rise in global temperature and atmospheric CO2, a rise that climate alarmists claim is unprecedented over thousands of years (temperature) to millions of years (CO2 concentration).

Plant species become adapted to local conditions over thousands of years, meaning that what is locally adapted today could do poorly tomorrow as the climate changes.

An examination of how scientists reconstruct the history of Earth's climate over hundreds of thousands — in some cases millions — of years.

These scientists also mentioned the supposed «stability of the Earth's climate over the past ten thousand years».

From my point of view, I saw that the climate had varied very widely over the last several thousand years, and in no way did I believe that proxy data (which averages and mutes annual signals) showed that the recent warming was unprecedented over the last 1000 or 2000 years.

I do not believe that global mean annual temperatures have simply cooled progressively over thousands of years as Mike appears to and I contend that that there is strong evidence for major changes in climate over the Holocene (not Milankovich) that require explanation

EPA's Clean Power Plan assumes shutting down U.S. coal - fired power plants will stop climate change, even if China, India, and other countries build thousands of new coal - fueled generators over the next 20 years.

Over the next year, your recurring gift will help us mobilize climate activists around the world and train thousands of new Climate Reality Leaders to take action in their commuclimate activists around the world and train thousands of new Climate Reality Leaders to take action in their commuClimate Reality Leaders to take action in their communities.

Slow changes to the orbit of Earth around the sun (Milankovitch cycles) do cause climate change — over thousands of years.

By matching rings from trees that partially overlap life spans, scientists can construct a continuous climate record over thousands of years.

You will be told that weather and climate are two different things because the climate system evolves and changes over hundreds or thousands of years and weather changes every minute / hour / day.

1.2 c of climate evolution over a century is not catastrophic and is well within the envelope of natural variation seen over the last few thousand years.

In his defense, perhaps he has concluded that the physics of the climate are more stochastic rather than deterministic, and accurate prediction over decades to hundreds of thousands of years is not possible due to chaos, he could be right, but alas, he could be wrong... who knows.

On blogs like Dr. Curry's I continually see learned, and heated, arguments over the meaning of fluctuations in the «annual temperature of the earth» in the hundredths of a degree range (sometimes thousandths), with data plotted over hundreds or thousands of years, while noticing that there doesn't seem to be a DEFINITION of the «Annual Temperature of the Earth» and that the climate science community, collectively, would be hard pressed to provide me with an «Annual Temperature of Bob's House» with a credible and defensible resolution and precision of + / -.01 degree, using an instrumentation system of their choice.

Obviously the climate of the region over the last thousands of years was everything but stable.

Many scientists used to think that only periodic changes in earth's orbit — so - called Milankovitch cycles — could change climate, over thousands of years, but Broecker has shown that ocean currents can influence climate in mere decades — and could do so again.

Nevertheless, as pieces of evidence accumulated, a growing number of scientists found it plausible that the climate over large regions, if not the entire world, had sometimes changed markedly in a thousand years or even less.