Bees are at risk due to four major planetary boundaries being exceeded: biodiversity loss, climate change, land conversion, and excess nitrogen and phosphorus in the environment. This relates directly to bees as many other species rely on bees for pollination and food, so declining bee populations could negatively impact other animals. Additionally, pesticides used in agriculture kill bees, and changing land use patterns have reduced available nesting and foraging habitats for bees. While companies market unproven bee-helping products, the major threats to bees stem from environmental changes caused by human activities.