Global Perspective

For some light summer amusement, I thought I would share a map I made a while back to satisfy my curiosity. I’ve had the plot in my office for several years and occasionally think to pull it out for visitors I suspect will enjoy it. I usually just hand it to them and let them puzzle over its meaning before I explain anything. It’s not meant to be an IQ test—although doubtless some feel that way—but rather a chance to delight in self discovery. I “discovered” the 7-24-25 Pythagorean triangle the other day quite by accident while constructing a relativity problem and was delighted by the find—even though Wikipedia has an exhaustive list of other sets wholly unknown to me. Likewise, I “discovered” Saturn as a 15-year-old on a summer night with a small telescope just poking around an unfamiliar sky. I danced around the yard in delight. My point is that discovery is personal, even if not original.

So here’s a chance to discover what the map is meant to convey. I’ll naturally explain later.


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Solar Data Treasure Trove

I have not kept it secret that I’m a fan of solar power. Leaving storage hangups aside for now, the fact that the scale of available power is comfortably gigantic, that perfectly efficient technology exists, that it’s hard-over on the reality axis (vs. fantasy: it’s producing electricity on my roof right now), and that it works well almost everywhere—what’s not to like? Did you trip over that last part? Many do. In this post, we’ll look at just how much solar yield one may expect as a function of location within the U.S.

The ancient Mayans laboriously accumulated a substantial set of observational data on solar illumination across America well ahead of the present need. Okay, it wasn’t actually the ancient Mayans. It was the National Renewable Energy Lab (NREL), who embarked on a 30-year campaign beginning in 1961, covering 239 locations across the U.S. and associated territories. Imagine this. How many people were even cognizant of solar power in 1961? Yet the forward-thinking scientists at NREL appreciated the value of a solid baseline dataset way back then. This level of foresight seems akin to the Mayans constructing a calendar going all the way to 2012. That’s all I’m saying. It’s a gift from the past.

I have often consulted and enjoyed the product of this work over the years—called the NREL Redbook, or more formally, the Solar Radiation Data Manual for Flat Plate and Concentrating Collectors. But with a snazzy blog post as motivation, I have taken it up a notch and produced a variety of graphical representations of the dataset to explore what it can tell us. Let’s begin the guided tour.

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Putting the Genie Back in the Toothpaste Tube

You may have heard about the excess carbon dioxide in the atmosphere as a result of our combustion of fossil fuels. If we wanted to sweep the excess CO2 out of the air, what would it take? How much is there? Where would we put it? In this post, we will put the numbers in perspective and briefly examine a few of the possibilities for storage.

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Personal Energy Cubes

In this post, we’ll put a physical, comprehendible scale on the amount of energy typical Americans have used in their lifetimes. No judgment: just the numbers.

The task is to estimate our personal energy volume, so that we can mentally picture cubic tanks or bins corresponding to all the oil, coal, natural gas, etc. we have used in our lives—perhaps plunked down in our backyards to bring the idea home. Go ahead and try to guess/picture how big each cube is.
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