The imrpoved agricultural techniques, such as the three field system, the climate change, and the horse plows. These effected Western Europe during the middle ages because the three field system produced better crops, the climate opened more land to farming, and the horse plows allowed faster harvesting. This made life a lot easier for farmers.
Agriculture changed because a lot of the supplies needed to farm and run the farms have been raised in price there for it is now more costly to run and operate a farm
