Startup making paper out of stones, not trees

Bloomberg:

To make a ton of regular paper requires 100 tons of water, TBM says, while its Limex paper is made without water. In place of 20 trees, it uses less than a ton of limestone, as well as 200 kilograms of polyolefin. The five-year-old startup recently raised an additional 1 billion yen ($9.1 million) from an existing backer, and aims to list its shares by 2020.

Limestone is plentiful, water, obviously, not. Surprisingly, paper use is growing rapidly, demand said to double by 2030. This is an interesting play.