This time Joe Romm takes a shot at how he thinks world temperatures have changed since the Little Ice Age, and the source of the information he uses is a site called Skeptical Science, and as we have said before, this site is NOT a skeptical site, it's just the name. And Joe does not refer to us as "skeptics" we are called "anti-science disinformers"
.......Joe, you guys are the real "anti-science disinformers"
Here’s a key point that the media has failed to explain and the the anti-science disinformers refuse to accept: The Earth’s overall temperature does not change randomly on a decadal scale — it changes when it is driven to do so by an external forcing.
The Little Ice Age is a case in point, as Skeptical Science explains in this repost:
The argument that we’re simply “coming out of the Little Ice Age (LIA)” makes one of two assumptions:
1.The planet oscillates around some natural equilibrium temperature such that after it cools, it must warm to return to this temperature, and vice-versa.
2.Whatever caused the LIA cooling has reversed phase and is now causing global warming.
The first assumption demonstrates a lack of understanding regarding what causes planetary temperature changes. The second does not hold up under scrutiny of the empirical data.
Climate Change Causes
A long-term increase in the Earth’s average temperature is caused by a change in the planetary energy balance (incoming vs. outgoing energy), also known as a ‘radiative forcing.’ If the amounts of incoming and outgoing energy are equal, the planet is in equilibrium and its temperature will not increase on average.
Note that over short periods of time, energy can be exchanged between the Earth’s oceans and surface air through natural cycles such as the Pacific Decadal Oscillation, which can result in a short-term warming of the surface oceans and air at the expense of a cooling of the deeper oceans, or vice-versa. However, these cycles oscillate between positive and negative states, which over the long-term cancel each other out and do not cause significant temperature trends. These oscillations neither create nor retain heat; they simply move it around and thus physically cannot cause global warming or cooling. Further, if these cycles were causing the surface to warm, they would be causing the oceans to cool, hich is the opposite of what we observe.
There are many different factors which can cause a planetary energy imbalance. Some of the most common examples are changes in solar activity, atmospheric greenhouse gases, volcanic activity, the Earth’s overall reflectivity, and variations in the Earth’s orbit around the Sun (also known as ‘Milankovitch cycles’). However, the key point is that the planet will not warm or cool over the long-term unless there is a radiative forcing causing a planetary energy imbalance. Thus the planet will not warm simply because it had previously cooled, and the notion that the planet is just “recovering” from the LIA makes no physical sense.
Little Ice Age Causes
Therefore, the only way the current warming could be because “we’re coming out of the LIA” would be if whatever caused the energy imbalance resulting in the LIA cooling had since changed state to cause a positive radiative forcing, thus resulting in the global warming we’ve observed over the past century. Climate scientists have proposed numerous factors which likely contributed to the global cooling of the LIA.
Decreased Solar Activity
The LIA occurred from approximately the 16th to 19th centuries. During this time frame, there were periods of significantly diminished solar activity known as the Spörer Minimum (1460-1550) and Maunder Minimum (1645-1715). These minima were discussed in a seminal study by Eddy (1976). Additionally, the Dalton Minimum was a less prominent period of diminished solar activity observed from 1790 to 1830.
Figure 1: Reconsructed total solar irradiance (Delaygue and Bard 2010
These periods of diminished solar activity were likely significant contributors to the LIA cooling. And solar activity has increased since the end of the Dalton Minimum to the current ‘Modern Maximum’. However, solar activity has not increased on average since the mid-20th century.
Figure 2: Total Solar Irradiance as measured by satellite from 1978 to 2010
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