The document provides various sources related to population, agricultural land use, and livestock impacts. It includes data on world population statistics, agricultural land percentages in the UK, and welfare standards for livestock. Additionally, it references an ebook discussing the land requirement for vegetable production.

2. Source 1 - http://www.worldometers.info/world-population/
Source 2 -
http://www.taipeitimes.com/News/world/archives/2005/12/07/20032
83384
Source 3 - http://www.tradingeconomics.com/united-
kingdom/agricultural-land-percent-of-land-area-wb-data.html
Source 4 - http://industry.freedomfood.co.uk/rspca-welfare-standards
(rspca list)
Source 5 -
https://books.google.co.uk/books?id=dNzLBQAAQBAJ&pg=PA581&lpg
=PA581&dq=how+much+land+can+grow+1+kilo+of+vegetables&sourc
e=bl&ots=iXbjDHMHSw&sig=mS3E9vvU1sm7vpXc7iqyHUhMMsU&hl=
en&sa=X&ved=0ahUKEwi8_PTawdHLAhVL2hoKHZmsCLs4ChDoAQgvM
AQ#v=onepage&q=how%20much%20land%20can%20grow%201%20ki
lo%20of%20vegetables&f=false (eBook)
Source 6 –
(http://www.wwf.org.uk/what_we_do/changing_the_way_we_live/fo
od/livestock_impacts.cfm) - maybe
Source 7 -