16% of all pesticides used worldwide are used to grow conventional cotton.
Notes:
This appears to be outdated data from the 1980s. The more up to date figures are: Around 5% of pesticides sold are destined for use on cotton, and 14% of insecticides from ICAC.
Primary Source:
Secondary Source:
https://www.patagonia.com/stories/regenerative-organics-drawing-a-line-in-the-soil/story-31178.html
https://rodaleinstitute.org/blog/9-ways-you-may-not-realize-cotton-is-in-your-food/