Recognition and validation test

At every visit to the hairdresser, hair over 30 centimetres in length can be used for wigs, shorter parts go into the bin. In sum, quite a large pile of hair is thrown away day by day this way. An alternative may be based on the fact that hair can absorb fat and it does not lose this property even after cutting. A kilogram of hair can absorb eight litres of oil.

A French initiative "Coiffeur Justes" has been collecting hair from the stock of hairdressers since 2018 and makes rolls and felt mats out of it, which are later used as filters in polluted waters.

You are running a start-up company that buys and renovates old houses in order to sell them for profit. For you, the renovation process is much more than simple maintenance, repairs and routine upgrades, it means the opportunity to increase the energy efficiency of the house, this way helping the environment and following your vision for a greener world.

One old house you bought needs extensive energy renovation: thermal insulation, new energy saving windows, eco-friendly heating and cooling systems, efficient lighting and others. However, this kind of renovation implies high costs that may put at risks the company profits.