It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
How much power does the Sun provide in comparison to the power produced by humans? Lots more, right?
Now, how much of that power escapes back into space and how much is retained? How much does the increasing amount of CO2 (and associated feedback) change that number?
Carbon Dioxide Fertilization Greening Earth, Study Finds
From a quarter to half of Earth’s vegetated lands has shown significant greening over the last 35 years largely due to rising levels of atmospheric carbon dioxide, according to a new study published in the journal Nature Climate Change on April 25.
An international team of 32 authors from 24 institutions in eight countries led the effort, which involved using satellite data from NASA’s Moderate Resolution Imaging Spectrometer and the National Oceanic and Atmospheric Administration’s Advanced Very High Resolution Radiometer instruments to help determine the leaf area index, or amount of leaf cover, over the planet’s vegetated regions. The greening represents an increase in leaves on plants and trees equivalent in area to two times the continental United States.
www.nasa.gov...
Measurements from the 1960s to the early 1990s, backed up by a wide range of data and a number of independent studies, showed there were substantial declines in the amount of the sun's energy reaching the Earth's surface. This reduction is known as "global dimming".
The observed "dimming" has strong regional differences across the globe. While the southern hemisphere saw modest dimming in the period 1961–90 (which has continued to date), the northern hemisphere saw much more significant declines (reductions of 4–8%). Since then some parts of the world, such as Europe and North America, have seen partial recovery (known as "brightening"), while other regions (most notably China and India) have seen further although regionally mixed declines.
Global dimming is not thought to be due to changes in the sun's luminosity, as these have been too small to explain the magnitude of dimming observed. Instead, air pollution from human activity is thought to be the major contributor. Aerosols which form from pollution can directly reflect and absorb radiation before it reaches the planet's surface and make clouds brighter and longer lasting, meaning they reflect more sunlight.
www.theguardian.com...
Global dimming has been artificially suppressing global warming. The same thing that has been causing global warming — burning fossil fuels as if they are inexhaustible fairy farts that produce nothing but rainbows — has been causing global dimming for the most part. Once the generation and transportation industries stop pumping pollution and CO2 into the air, the dimming problem will go away pretty quickly, but the CO2 will linger for a couple of hundred years. That means that sunlight which currently isn’t getting to the ground, being reflected as infrared and being absorbed by excess CO2 today, will be tomorrow. That means that the temperature inhibitor of dimming will be removed and it will get potentially a degree or two warmer.
www.forbes.com...
Obviously.
Indeed, so much so the Sun is probably the single greatest driver of temperatures on the surface of Earth.
Except, they don't fail to do so. (That documentary is from 2007, maybe you should find something more up to date. And maybe something that doesn't cherry pick the models but looks at all of them.) The planet is warming at a rate consistent with most models.
I posted a doco a few months ago where scientists were discussing the flaws in the theory behind CO2 driven temperatures and how the predictions of that theory have constantly failed to match observations.
And yet, temperatures continue to rise.
The greening represents an increase in leaves on plants and trees equivalent in area to two times the continental United States.
Not contradictory at all. But the trouble is, particulate pollution is quite unhealthy and is therefore quite undesirable..
Also this seems like quite a contradictory argument considering that we know increased levels of pollution causes more light to be reflected into space and creates a dimming effect.
We are seeing that warming (see above).
This is then used as an argument for why we haven't seen as much heating as predicted by the greenhouse effect, and they say that once we cleanse the atmosphere of reflective aerosols we will see the global warming which was predicted,
originally posted by: Phage
a reply to: ChaoticOrder
The planet is warming at a rate consistent with most models.
Our current warming is well within natural variation, and in view of the general decline in temperatures during the last half of this interglacial, is probably beneficial for mankind and most plants and animals. The graph clearly shows the Minoan Warming (about 3200 years ago), the Roman Warming (about 2000 years ago), and the Medieval Warm Period (about 900 years ago). Great advances in government, art, architecture, and science were made during these warmer times.
Incorrect.
Yes but only if we include the ocean temps, land temps alone are usually rather stable over long periods of time.
Looks like it's been steepening lately. But sea level is a tricky thing to measure.
This chart is from the lecture I posted on the last page:
Datasets that go back 2000 years. No. But there are reconstructions using proxies. Here are the results of a more current and comprehensive effort.
More concretely, this chart was created using 30 different datasets to estimate temps going back 2000 years, clearly showing temps have been just as high or even higher in Medieval and Roman times, before we started pumping out large amounts of CO2 into the atmosphere.
There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between ad 1580 and 1880, punctuated in some regions by warm decades during the eighteenth century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the period ad 1971–2000, the area-weighted average reconstructed temperature was higher than any other time in nearly 1,400 years.
More than that.
We've seen something like a 0.8°C rise in average global temps since 1900
Sure. You can always say the data is bad.
and I'm not even convinced we are capable of measuring the global average temperature with a high enough degree of accuracy to bring the uncertainty down to a fraction of a degree
originally posted by: MisterMcKill
a reply to: Phage
Right. So there are lies, there are damned lies, and there are statistics. I know you have heard that one before. It applies here.
originally posted by: Phage
a reply to: ChaoticOrder
Incorrect.
Since 1980 CO2 emissions from the developed world have shown virtually no increase, whereas the developing world has had a fourfold increase since 1980.
The record of recent Man-made CO2 emissions: 1965 -2014
Datasets that go back 2000 years. No. But there are reconstructions using proxies. Here are the results of a more current and comprehensive effort.
In Europe. Not as hot as today. See the colored lines? In all regions? That's "today." In all regions.
The temperature axis has been extended and so the resulting curve is more squished and the trends are less apparent, but you can still clearly see in the Europe multiproxy chart there are clear warm periods reaching temps just as high as today, the little ice age is also still quite apparent in those charts.
originally posted by: Phage
...
But do you ever wonder why "sources" like yours have to take statements grossly out of context? Do they think you won't notice?
originally posted by: game over man
a reply to: burdman30ott6
Why don't you simply go get a job that has to do with some form of water, either ocean, lake, river or snow. Work there for sometime and share your results.