Pesticides.
There are 289 pesticides licenced for use in the UK. If all farming was organic, then pesticide use would be virtually non-existent as Soil Association farmers can only use a limited number of naturally derived pesticide,s like citronella and clove oil, as a last resort. That is why organic farming is so important in tackling our nature crisis – with a third more species,  50% more abundant wildlife and 75% more wild bees on organic farms.