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What the hell is Photo Bio Reactor? It is an “artificial environment for photosynthetic organisms” that basically eats the CO2 from the air. And now you can build your own for $200:

I have wanted to do this a project for a long time and with earth day this year it kinda just fit timing wise. Its really a simple and quick build, yet getting the level up in bio-friendly-geek makes this all the more fun. Now I admit that I have a lacking of unquenchable aspirations to being a hugger of trees or a crusader of tofu and hemp. But I do believe in making changes so that the poor saps that come along after me might have the world a little less badly off for them. Let’s face it, we kind of effed up the whole earth thing… But in all seriousness, once we get a good strong colony established we will be doing some testing of the amount of carbon these can remove from our environment with a C02 PPM meter.

Here’s a video showing when the gadget is working:

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What if we make a gadget that not only absorb CO2 but also produce energy? Technology Review has an article about supplying the world’s energy need with light and water.