Life cycle analysis (LCA) is a method of measuring the environmental impacts of building products over their whole life. The aim of a life cycle analysis is to identify, quantify and assess the impact of the energy and materials used and wastes released to the environment throughout the life of a building product. There are many life cycle analysis methodologies and all vary in their range and complexity but it all comes back to sustainability.
The life cycle analysis of timber follows the piece of wood from harvesting, manufacture, construction and product life to recycling and disposal. Life cycle assessments of common alternative construction materials (like cement and aluminium) have shown that many other materials require larger energy inputs during manufacture than timber. This energy is typically sourced from non-renewable fossil fuels. In contrast the manufacture of wood products typically requires far less energy.
Paarhammer makes their timber windows and doors in a purposebuilt manufacturing plant with many sustainable features.
Good information found at: http://www.woodsolutions.com.au/ and http://www.plantations2020.com.au/assets/acrobat/Forests,Wood&CarbonBalance.pdf where those statistics below are sourced from: