From the perspective of the output, the traditional GDP is calculated on the basis of the total volume of the products produced by the traditional industrial sector, and the final products (output) equals the total output minus the economic cost of inputs.

However, in the process of production and consumption of goods and services, environmental and social costs maybe incurred and are considered an externality in the traditional calculation of economic growth and GDP.

The additional increase in value created by environmental protection organizations (resources recovery and pollution treatment organizations) should be regarded as newly additional part of the output.

The formula of the Green GDP encapsulates the value added of environmental protection and the associated costs of production and consumption of goods:

Green GDP = Final total output of traditional industrial sectors - damage to the resources and environment + total new value created by environmental protection organizations / total cost (created by the traditional industrial sector, environmental protection organizations and the final using sectors)

The goal is to enter into a binding global climate agreement at the United Nations Climate Change Conference in Copenhagen. The agreement will apply to the period after 2012.The government’s ambition is for the agreement to include as many countries as possible, and that the agreement must contribute to a reduction in man-made greenhouse gases which have a negative effect on our climate system. Governments' will therefore put all its efforts into obtaining an agreement that combines respect for the environment, living standards and long-term security of energy supply in the best way possible. The climate changes are considered one of the greatest challenges of the world. There is a need for everyone to limit the emission of CO2. With this overall goal and motivated by the hosting of the COP15, the Ministry of Foreign Affairs has started to look closer at the relationship between trade and climate. The question is if and how trade policy instruments can contribute to the fight against climate change. This initiative was launched at the informal meeting between the ministers of trade, which took place in the margin of COP13 on Bali, December 2007. At the annual trade politicy conference on the 9th of May 2008 at the University of Copenhagen the focus was “WTO – trade and climate”. On the basis of presentations from minister of foreign affairs, Per Stig Møller, minister for trade and development from the UK, Gareth Thomas, and vice-secretary for WTO, H.V. Singh there were discussions on the latest developments in the Doha negotiations and on the question of how the international trade system could contribute to the fight against climate change. The conference was well attended with a wide variety of guests consisting of academics, politicians, business people and NGOs.