This reminds me of Mendeleyev's concerns about major environmental problem of the XXth century city - horse poo. Megatons of horse poo. How could possibly we ha

This reminds me of Mendeleyev's concerns about major environmental problem of the XXth century city - horse poo. Megatons of horse poo. How could possibly we handle that? History proved that technology can save us from predicted environmental impact of horses made by one of the brightest minds of its time. Same thing with uranium depletion problem. In 100 years we probably shall have effective thorium reactors, thanks to Norway and China, solar power stations on the Moon and who knows what else. Just lets don't stop thinking and tinkering.