Ask Umbra
Grist’s destination for advice on life during climate change. Est. 2002
Past Umbra
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Umbra on wave power
Hello Umbra, I just read a little bit about wave power and was wondering what you think the future potential is for this clean and never-ending energy source? Peter Blomquist Orlando, Fla. Dearest Peter, Wow. I’m a sucker for anything with a good name, like “LIMPET.” There are fun technologies under development to harness the […]
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Umbra on feeding birds
Dearest Umbra, Every winter I take pleasure in putting out birdseed to feed the backyard wildlife. I purchase the easily available, run-of-the-mill, found-at-my-local-hardware-store type of seed. My question is, in the big picture … am I doing more harm than good? If the feed I am using is grown conventionally, am I doing a greater […]
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Umbra on tidal power
Dear Umbra, Much is made of wind, solar, geothermal, and even wave power, but why doesn’t anyone talk about tidal power? It has more power than wind for the same turbine, without the eyesore of turbines, is totally renewable, and is predictable hundreds of years in advance. Yet nobody talks about it. What’s wrong with […]
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Umbra on solar hot-water systems
Dear Umbra, I would like to change to solar heating for providing some of our electricity requirements, particularly for hot water. Can you advise me how to go about it? Leela Pienaar Grahamstown, South Africa Dearest Leela, I notice you’re in South Africa. I can talk about solar equipment as found in the U.S., and […]
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Umbra on thin-film solar panels
Dear Umbra, I read that thin-film solar panels are now being produced on a wider scale. I always hear that they can be sandwiched into window glass, but are there any companies that are actually using the technology in architectural products? How does thin film compare to the traditional PV panel? Jen Oakland, Calif. Dearest […]
