1. World Bank Agriculture and Foodhttps://www.worldbank.org/en/topic/agriculture/overview
2. World Bank Agriculture, Forestry, and Fishing, Value Added (% of GDP)https://data.worldbank.org/indicator/NV.AGR.TOTL.ZS?most_recent_value_desc=false
3. FAO Coping with Water Scarcity in Agriculture a Global Framework for Action in a Changing Climatehttp://www.fao.org/fileadmin/user_upload/newsroom/docs/GlobalFRA-brochure.pdf
4. Agriculture: Definition and Overview;Harris,2014
5. Non-CO2 greenhouse gases and climate change