There are a lot of sites to find that happy on the internet on this subject. That means that a lot of institutions and persons concerned with climate and population.
To give a small overview of interesting sites: below some links where you can find more information. Some links (*) have already been mentioned on my site.
https://biflatie.nl/artikelen/overig/overbevolking-is-the-greatest-problem/
(*) https://www.cbs.nl/nl-nl/nieuws/2016/08/minder-landbouw-meer-natuur
http://www.who.int/mediacentre/factsheets/fs266/en/