3 Responses to “Hot 5: Farmland Prices. GMOs are NOT Scary. Ken Caldeira on Climate Change. 23 Million New U.S. Acres Plowed for Crops. Documentary “Generation Food”.”
KM…hope you are doing well. Quick comment…it is obvious Calerda is a smart person and even he says the scope of that article was so board it is hard to make generalizations on the scale requested. That said…I think this is clearly wrong: “In a high CO2 world, plants can grow more using the same amount of water. … The outlook may be for increased crop productivity overall…” Most agronomists will tell you that gains from enriched CO2 environments are fairly small, and in the case of climate change often eliminated or out-weighted by extreme weather events that are much more likely to occur. Just a thought, thanks for your continuing blog efforts.
James,
First of all, nice to hear from you again. Welcome.
Not sure if you have a copy of the SciAm issue but the sentence “In a high CO2 world, plants can grow more using the same amount of water.” was lifted from a number of paragraphs trying to explain the logic behind it including a difference between plant growth in the tropics vs the far north.
One thing about Caldeira is he was taking the really big picture view for the whole globe for a vast time period. Statements were made with broad strokes.
KM…hope you are doing well. Quick comment…it is obvious Calerda is a smart person and even he says the scope of that article was so board it is hard to make generalizations on the scale requested. That said…I think this is clearly wrong: “In a high CO2 world, plants can grow more using the same amount of water. … The outlook may be for increased crop productivity overall…” Most agronomists will tell you that gains from enriched CO2 environments are fairly small, and in the case of climate change often eliminated or out-weighted by extreme weather events that are much more likely to occur. Just a thought, thanks for your continuing blog efforts.
Oh…and I did mean here…gains from food crop plants…exactly right that in a CO2 rich world, what we call “weeds” will grow like gangbusters.
James,
First of all, nice to hear from you again. Welcome.
Not sure if you have a copy of the SciAm issue but the sentence “In a high CO2 world, plants can grow more using the same amount of water.” was lifted from a number of paragraphs trying to explain the logic behind it including a difference between plant growth in the tropics vs the far north.
One thing about Caldeira is he was taking the really big picture view for the whole globe for a vast time period. Statements were made with broad strokes.