Burning fossil fuels in agriculture contributes about 1% of total global warming. Nitrous oxide also depletes the ozone layer. These are in addition to the use of fossil fuels for fertiliser production (see land) that also contribute indirectly to global warming.

Increasing levels of ammonia evaporating from animal manure (especially slurry) and fertilisers contribute to acid rain - sometimes up to 20% of acid deposition. The problem is most noticeable in the Netherlands, Denmark, northern Germany, western France, eastern England and north of Italy. This contributes to the destruction of forests in these and neighbouring areas

Over a billion gallons of pesticide based liquid is sprayed in the UK Between 50-90% of applied pesticides evaporate into the air. They contaminate rain and snow and have been known to travel long distances like to the arctic. Now it is raining pesticides. Chemicals evaporate and become part of the clouds. Previously, the only pollution from pesticides was presumed to be through ground water.

Some pesticides deplete the ozone layer. Methyl bromide, a fumigant, is over 30X more destructive to ozone than CFCs.