numbers

Adam Something argues that the Hyperloop is impractical, covering the costs and engineering problems of running trains in a near vacuum compared with conventional rail and metros. The description admits some wrong numbers in the original cut.

Thunderf00t critiques the TeamTrees campaign, doing the math on how little carbon 20 million trees would actually offset. He argues that tree planting is far from adequate against global emissions.

EEVblog's Dave Jones critiques Reflect Orbital's plan to sell sunlight to solar farms after dark using orbital mirrors. He walks through the numbers to show the idea does not work out.