This seems bogus to me. There are many more acres of agricultural land vs lawns. Without looking it up I would guess agricultural land accounts for over 90% of the herbicide and pesticide use. We are not going to save the environment by having tiny patches of chemical-free land while huge swaths outside the cities are being doused.
>"Homes, golf courses and parks may grow more acres of turf grass than U.S. farmers devote to corn, wheat and fruit trees — combined [..] 2005, researchers estimated there are 40 million acres of turf grass in the U.S., covering 1.9 percent of the land." - https://scienceline.org/2011/07/lawns-vs-crops-in-the-contin...
40 million acres for lawns in the US (2005), 357 million acres of land for crops (2007). However it is very surprising that we use significantly more land for lawns than for corn.
Corn is only one crop, and it has incredibly high caloric yields per acre (Much higher then grains, greens, vegetables). It is second only to potatoes in calories/acre.
