Climate Ask 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 […]
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Umbra on seltzer bottles
Dear Umbra, I love drinking fizzy water, especially in the summer, but I am appalled to learn that the plastic bottles use petroleum in their production. Plus, hauling them home from the supermarket burns gas. I’ve been looking at seltzer bottles, also known as soda siphons, the original source of carbonated water, and also much […]
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Umbra on returnable bottles
Hi Umbra, I’ve been wondering lately what happened to the returnable bottles that were so common up until some point in the ’70s. Why did the legislation go away? Does reusing bottles use less energy? It seems like it would, but I haven’t found info on advocating for bottle reuse in any of the green […]
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Umbra on albedo
Hi Umbra, Can we make small changes to increase the albedo in the Northern Hemisphere? Choose white or light-colored autos (white is safer, anyway), white or light-colored roofs. Could we float white “islands” (recycled Styrofoam) in our lakes and oceans in locations that would not disrupt transportation? Sometimes white plastic bags get caught in the […]
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Umbra on cane toads
Dear Umbra, I’m currently studying in Australia. I was recently in Queensland, where as you probably know, cane toads are a huge problem. There are over 200 million of the toxic toads, and this invasive species has been killing off native wildlife and just in general causing lots of problems. In fact, they have huge […]
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Umbra on graduation gifts
Dear Umbra, The recent question about a senior gift to the school got me wondering: what are some green gift ideas for graduates? Misty Boyd Tahlequah, Okla. Dearest Misty, Cash. You could help them set up a retirement account. With this answer, I think Grist will have covered most gifting opportunities: Valentine’s Day, weddings, babies, […]
