We shall talk about the different types of insulation and the pros and cons of each of them. Insulation materials can be divided into three groups.

First is mineral insulation, these are made from natural materials such as volcanic rock, salt, or even glass. These materials are industrially transformed to produce wool. The materials used for mist insulation are mineral wool and glass wool. Producing these types of insulation is not very ecological. The process of transformation of a primary material into wool uses a lot of energy and releases a lot of CO2 into the atmosphere. The advantages of this type of insulation are the low costs and fire resistance. These insulations can irritate If you're handling these types of insulation protect yourself with a mass, gloves, and protective glasses. 

Secondly, synthetic insulation, it's created from crude oil. Some examples are polyurethane and polystyrene foam. The pros of this type of insulation are the cost and their strong insulating properties meaning you can use a thinner layer. These types of insulation are created from non-renewable primary materials. 

Thirdly is bio-sourced insulation. Bio insulation comes from a plant or animal-based material. Some examples of bio-sources insulations are hemp, cotton wool, sheep's wool, straws, feather, coal, and pulp wading from the recycled newspaper. The strength of this type of insulation is its low ecological impact, manufacturing then requires low energy consumption and the primary materials used are renewable. These insulations are treated with a fire retardant. However, these are manufactured in small quantities and are expensive to buy. But at the end of the day, it's your personal choice as to what kind of thermal insulation glass wool would you prefer at your homes.