Externalities in agriculture can be positive or negative. Positive externalities occur when agricultural production or consumption benefits third parties, such as honey producers aiding pollination or beautiful gardens providing enjoyment. Negative externalities happen when agriculture harms third parties, like pollution from steel plants or carbon emissions from vehicles contributing to global warming. Governments can address externalities by taxing negative externalities, subsidizing positive ones, regulating pollution, and providing incentives for environmentally friendly choices.