1. United nations framework convention on climate change,2015
2. Climate action plan 2050 - Principles and goals of the german government's climate policy,2016
3. Danish Energy Agency. Denmark's Climate and Energy Outlook 2020 2020:1–65.
4. Sweden's long-term strategy for reducing greenhouse gas emissions,2020
5. H.M. Government. The ten point plan for a green industrial revolution 2020:14–6.