I agree with this. I also agree with a possible anthropogenic contribution, although I am unsure of the magnitude of this contribution and if any actions taken to reverse it will make a meaningful difference in the overall climate change cycle. Sensible actions to try and reverse it may be worth it, if we can get data to support this approach.
With only about 100-150 years of reliable data gathering of questionable value (thermometers of today installed on "heat islands" such as concrete airports compared against 100 year old thermometer readings from some Edisonian-era rural installation), and a geological record demonstrating thousands/millions of years of heating and cooling cycles, and the 70's scare over globular coolulation that has been completely abandoned in a 15 year span to be renamed globular warmification, and the new science of heliometeorology only just now beginning to emerge...
(And who's to say these numbers are accurate for 18th and 19th centuries? Or early 20th? Were there really any mechanisms to count sun spots back then? How many astrophysicists were there back then? How sophisticated were their data collection techniques? How many did they miss? Our counting techniques today are different than theirs back then, since we have STEREO satellites, automated computer systems doing the counting, and 24 hour observation around the world.)
I dismiss all globular warmulists. Period.
If the variances in question were 5 degrees or more, I might give it credence. Maybe. And if the data wasn't questionable, like comparing 75 year old temperatures in PHX before we grew a concrete jungle, to today's readings from the center of Sky Harbor Airport.
A degree or two variance inside of a century or so, when we don't even have enough data to formulate a baseline anyways, and have no reasonable expectation of a baseline even being a factual norm in the first place... there's at least 500 years of science that needs to be done before we consider any action at all.
Our current plan for globular changeism is about the same as a newborn baby opening its eyes for the first time and saying the color of the house is wrong, when it has all of about 1 second experience with any colors in the first place. We're blind and inexperienced in this field.