Organizers say two million people marched in protest against seed giant Monsanto in hundreds of rallies across Canada, the U.S. and dozens of other countries on Saturday.
"March Against Monsanto" protesters say they wanted to call attention to the dangers posed by genetically modified food and the food giants that produce it. Founder and organizer Tami Canal said protests were held in 436 cities in 52 countries.
Most corn, soybean and cotton crops grown in the United States today have been genetically modified. But some say genetically modified organisms can lead to serious health conditions and harm the environment.
Monsanto Co., based in St. Louis, said Saturday that it respects people's rights to express their opinion on the topic, but maintains that its seeds improve agriculture by helping farmers produce more from their land while conserving resources such as water and energy.
The American Food and Drug Administration does not require the labeling, but organic food companies and some consumer groups have intensified their push for labels, arguing that the modified seeds are floating from field to field and contaminating traditional crops.

FDA sees no difference between GMO and non-GMO foods

Whole Foods says there is growing demand for products that don't use GMOs, with sales of products with a "Non-GMO" verification label spiking between 15 per cent and 30 per cent.