Climate Change

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Warming trend

First, we take a look at a plot of global temperature 1880. There is a clear warming trend, although in the mid 1940s the climate was cooler for a while, and in recent years, it has flattened. But overall, the trend is nearly monotonic.


Greenhouse Effect Basics

The leading theory is based on the "Greenhouse Effect. Increased greenhouse gases (GHG), such as Carbon Dioxide (CO2) theoretically results in an increase in temperature. Solar energy goes in but is kept in due to the blanket-like action of those GHG.


CO2 and Temperature Synchronization

It is pretty clear that temperature and CO2 move in unison over historical record of about 400,000 years. Some people say that it appears that CO2 "follows" the temperature curve (higher CO2 results from higher temperature) rather than the more popular idea that the temperature follows CO2 levels. But this may also be due to the way the data was gathered.


Hottest Decade on Record

Climate science is relatively new and there are still many questions to be answered. But no one really resists the concept that a warming trend does exist. We may see temperature ups and downs, but the recent decade was the hottest one in our recent records.

Those companies that wish to continue to pollute will push against the realization that human activities do impact the climate and is definitely at least a contributor to the global warming trends. There is a overwhelming scientific consensus that human caused emissions, so-called "anthropogenic" emissions are the most important forcing cause of climate change. But there is an orchestrated agenda to undermine this consensus by the "denier" crowd. For more details, start with this lecture, presenting an excellent historical overview of the established scientific consensus that global warming exists, and it is driven by green-house gases produced by burning fossil fuels.


Plot of Warming since 1970

The plot of global surface temperatures since 1970 clearly shows a flattening of the curve in recent years, drawing claims that we are experiencing a "pause" in the trend predicted due to GHG emissions, which are off the charts.


A Pause?

By carefully selecting the starting point, recent data can be viewed in isolation to seem to show a pause in warming. Indeed, this was unexpected.


IPCC Climate Models vs. Observed

The recent "pause" in the expected warming is now in stark variance with estimates of the temperature as proposed by IPCC Climate Models. However, these climate models are only rough estimates using if-then scenarios. Many scientists are now proposing that the oceans play a much larger role in absorbing the heat, as well as the energy absorbed by melting glaciers and the ice in Greenland and the arctic. These theories still need to be included in the models so they will accurately model the "pause" being seen. Several papers now state that although we are experiencing a pause, it likely will not happen again for many decades.


Sea Level Increasing monotonically

The sea level is increasing on a monotonic basis, largely due to expansion of the water due to increased temperatures, rather than due to additional water added from melting inland ice. Arctic ice or ice berg melting does not add to the sea level as this ice is floating, whereas ice melting from inland Antarctica and Greenland will add to sea levels.


Longer global climate history

Scientists have reconstructed global temperatures over a 10,000 year period from Greenland ice cores. Surprisingly, it shows that we are in a relatively cold period.

  • Warming trends for 2000 years:

  • Climate history for about 4000 years:

  • History of climate change since the last major ice age.:


What is driving this?

The major scientific theory is that greenhouse gases are driving climate change. There is widespread agreement among climate scientists that these emissions are driving climate change. Of course there are many who disagree with this theory, and it can be argued that they are underwritten by the fossil fuel industry. But for the purposes of this article, we will go along with the leading theory. What is driving the use of fossil fuels, and do we have a hope of reducing it?

The primary drivers of increases in fossil fuel use is the increase in world population and the increases in per-capita energy use. The result is that in recent decades, the population has increased seven times over, and the use per-capita has increased nearly 10 times, resulting in use up by 66 times. There is no end in sight to the population surge but this will wind up being the most important single issue in the future for many reasons in addition to energy use. Family planning, contraceptives, and safe and easily available abortions will all be essential. Increases in women's rights tends to also result in smaller families.

In terms of per-capita energy use, much of the increase is due to the undeveloped world increasing their use of energy. Highly developed areas, such as California, have remained flat in terms of energy use in recent years. So once undeveloped areas start to use energy, they main driver will then continue to be the population.


Fossil Fuels Face Depletion

Experts disagree on the exact date, but over the next decades, we will face the depletion of many sources of fossil fuels. In recent years, we have seen new technologies, such as "fracking" which can remove additional natural gas from wells that were previously believed to be depleted. This practice has many drawbacks, and is poorly regulated in terms of the chemicals used in the toxic mix injected in these wells to release additional gas, and there has been linkages to increased earthquakes in those areas. Thus, getting the last few drops of oil, puffs of gas, and blocks of coal, will have substantial negative impacts on the environment.

But regardless of the exact date, there is no question that eventually we will deplete resources, at least to the extent that it costs more energy to extract it than we get out. When that happens, it is not worth taking the fuel out of the ground. The chart shown here is an estimate from experts on the likely curve of production of fossil fuels. As we go past "peak oil" and go down the downside of the curve, the cost goes up accordingly.


Resource Depletion Not Included In Climate Models.

As climate models are if-then scenarios, they do not necessarily include the fact of fossil fuel depletion mentioned above. Although running out of those fuels sounds like a really bad thing, it is a good thing when it comes to the outlook of climate change. When Cal Tech included resource depletion in climate models, the curve, at the bottom, is much "better" than any of the other climate models whci assume we have unlimited fossil fuel supplies. Thus, climate change will only get so bad, even if we use up all fossil fuels that are economically viable to produce. But it will still be significant.


CO2 Levels Kept down

Given the natural limit to the fossil fuels available, CO2 levels only go so high. If we struggle to limit fossil fuel use now, the curves are held down a bit and the implications of climate change can be mitigated somewhat. However, if we are unsuccessful in making those changes, then the fact that fossil fuels are limited keep CO2 levels down in these simulations.

Please understand that all these climate models are FAR FROM COMPLETE and are nearly impossible to get right because our climate is very complex.

We have one of the best sources for fighting global warming literally in our backyards. Plants, particularly trees, absorb carbon dioxide and provide us with clean oxygen to breathe. Some experts believe that a contributing factor to global warming is that we have cut down so many of our trees and forests for industry. By supporting foundations and organizations that protect forests and encouraging sustainable logging practices, you can help bring our planet’s temperature down. Don’t forget, however, that you can help the fight against global warming all on your own, and even get a new hobby out of the effort.

Gardening is a healthy activity and a fun way to make your home or community beautiful. One tree will absorb over 2000 lbs (906 kg) of carbon dioxide over its lifetime, preventing that gas from getting into the atmosphere. If you have room to plant a tree in your yard, try to do so. Remember, even if all you have space for is a window box, most plants are beneficial to the air and help absorb carbon dioxide and create oxygen. If you can, use organic soil and fertilizer, as harmful chemicals may damage the environment, and actually add to the greenhouse gas problem.

According to Earth Sky Communications, Inc. a car in the U.S. on average puts out 7,700 Kg of Co2 (16,940lbs) a year.

A pretty interesting site with daily astronomical and terrestrial weather:

Here is a typical attempt by opponents to the scientific consensus to generate a sense that there is still widespread debate. It asserts that global warming is due only to sun variation, and its credibility is under question.

The following paper is very important as it systematically refutes the primary claim in the Great Global Warming Swindle

In this paper, the researchers studied the abundances of two isotopes, C-14 and Be-10, both of which are created with interaction with cosmic rays. The paper claims that the source of the two elements (tree trunks and ice sheets or ocean sediments) is very different but they show a correlation. Since the primary source of Cosmic Ray flux is the sun, these elements can be used to provide a history of solar variability.

The conclusion of this paper states:
There are many interesting palaeoclimate studies that suggest that solar variability had an influence on pre-industrial climate. There are also some detection–attribution studies using global climate models that suggest there was a detectable influence of solar variability in the first half of the twentieth century and that the solar radiative forcing variations were amplified by some mechanism that is, as yet, unknown. However, these findings are not relevant to any debates about modern climate change. Our results show that the observed rapid rise in global mean temperatures seen after 1985 cannot be ascribed to solar variability, whichever of the mechanisms is invoked and no matter how much the solar variation is amplified.

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Number of topics: 15


Project Form edit

Project Name Climate Change
Project Description Investigation into the debate over anthropogenic climate change based on Greenhouse gasses.
Project Founder Raymond Lutz
Project Curator Raymond Lutz
Project Type Issue Oversight
Project Parents Energy Policy
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I Attachment Action Size Date Who Comment
2000_Year_Temperature_Comparison.pngpng 2000_Year_Temperature_Comparison.png manage 38 K 25 Nov 2014 - 02:18 Raymond Lutz Warming trends for 2000 years
GreenlandIceCore.pngpng GreenlandIceCore.png manage 273 K 25 Nov 2014 - 02:20 Raymond Lutz 10,000 years of global temperature history from greenland ice cores
IPCC_Climate_Models_vs_Actual_Observations.pngpng IPCC_Climate_Models_vs_Actual_Observations.png manage 409 K 25 Nov 2014 - 03:34 Raymond Lutz IPCC Climate Models vs. Observed
RoyalSocietyPaperOnSolarActivityVsClimateChange.pdfpdf RoyalSocietyPaperOnSolarActivityVsClimateChange.pdf manage 536 K 26 Jun 2014 - 21:23 Raymond Lutz The Royal Society: "Recent oppositely directed trends in solar climate forcings and the global mean surface air temperature " Lockwood & Frolich
Warming_since_1880_yearly.jpgjpg Warming_since_1880_yearly.jpg manage 65 K 25 Nov 2014 - 02:17 Raymond Lutz Plot of global warming trends since 1880
Warming_since_1970.jpgjpg Warming_since_1970.jpg manage 84 K 25 Nov 2014 - 02:17 Raymond Lutz Plot of Warming since 1970
basicGHGwarming.gifgif basicGHGwarming.gif manage 37 K 25 Nov 2014 - 02:15 Raymond Lutz Basic Greenhouse Effect Graphic
clip_image002_thumb.pngpng clip_image002_thumb.png manage 155 K 25 Nov 2014 - 02:22 Raymond Lutz Recent data can be viewed in isolation to seem to show a pause in warming
global-cooling-graph-719171.jpgjpg global-cooling-graph-719171.jpg manage 62 K 25 Nov 2014 - 03:40 Raymond Lutz Climate history for about 4000 years
historyOfClimateChangeSinceLastMajorIceAge.pngpng historyOfClimateChangeSinceLastMajorIceAge.png manage 87 K 25 Nov 2014 - 02:21 Raymond Lutz History of climate change since the last major ice age.
hottest_decade_on_record.gifgif hottest_decade_on_record.gif manage 12 K 25 Nov 2014 - 03:36 Raymond Lutz Hottest Decade on Record
img65.jpgjpg img65.jpg manage 45 K 06 Mar 2015 - 19:49 Raymond Lutz Climate change if resource depletion is included in models
img66.jpgjpg img66.jpg manage 43 K 06 Mar 2015 - 19:54 Raymond Lutz Simulated CO2 levels with resource-depletion included in the models (Caltech)
img68.jpgjpg img68.jpg manage 57 K 06 Mar 2015 - 19:52 Raymond Lutz Fossil fuels will not last forever, depletion to occur in the next century.
img77.jpgjpg img77.jpg manage 64 K 06 Mar 2015 - 19:51 Raymond Lutz Population and increases on per-capita basis is driving energy use sky high.
sea_level_guardian.jpgjpg sea_level_guardian.jpg manage 61 K 25 Nov 2014 - 03:38 Raymond Lutz Sea Level Increasing monotonically
vostok.jpgjpg vostok.jpg manage 54 K 25 Nov 2014 - 03:42 Raymond Lutz Temperature and CO2 move in unison over historical record
Topic revision: r28 - 12 Mar 2018, RaymondLutz
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