Even if there's a (small) current trend in the opposite direction for farming, we're not going to go back to the level of productivity of the 1800s, or the 1900

Even if there's a (small) current trend in the opposite direction for farming, we're not going to go back to the level of productivity of the 1800s, or the 1900s, or even the 1950s. The overall trend over the past 200 years in farming has overwhelming toward increasing yield.