3 ms·

The extra carbon in the air has already made plants more productive so there’s some offset already.

by merpnderp 5y ago

IntrepidWorm 5y ago
This seems plausible, but I'm curious if you have a citation?
- chrisco255 5y ago
  https://www.nasa.gov/feature/goddard/2016/carbon-dioxide-fertilization-greening-earth/ https://www.nasa.gov/feature/goddard/2016/carbon-dioxide-fer...
ncmncm 5y ago
Invasive weeds and vines, mainly. Poison ivy, kudzu, and virginia creeper grow faster. Most plants cannot use all the carbon they already get. Instead, they get less able to compete as the weeds choke them.
- chrisco255 5y ago
  Not true at all. Most plants can use additional carbon all the way to 1000+ PPM. Some all the way to 2000PPM. Quotes below, sources below that: - CO2 increased leaf area, water use efficiency, and harvest index (in tomatoes) [1] - Optimal levels for tomatoes may be 2 to 5 times the normal atmospheric levels (1000 to 1500 ppm CO2 versus ambient levels of 350 ppm) [2] - Combining increases in CO2 with fertilization and irrigation could greatly enhance leaf area which when coupled to observed increases in net photosynthesis as a result of elevated CO2 could greatly increase productivity of loblolly pine trees. [3] - demonstrating an optimal CO2 concentration of 889.6, 909.4, and 894.2 ppm for aboveground, belowground, and total biomass, respectively, and 967.8 ppm for leaf photosynthesis (in winter wheat) [4] [1] https://www.sciencedirect.com/science/article/abs/pii/S0378377419320463 https://www.sciencedirect.com/science/article/abs/pii/S03783... [2] https://cals.arizona.edu/hydroponictomatoes/nutritio.htm https://cals.arizona.edu/hydroponictomatoes/nutritio.htm [3] https://link.springer.com/article/10.1007/s004680050111 https://link.springer.com/article/10.1007/s004680050111 [4] https://pubmed.ncbi.nlm.nih.gov/26253981/ https://pubmed.ncbi.nlm.nih.gov/26253981/
  - monort 5y ago
    Elevated CO2 concentration favors plants with C3 pathway, because they appeared when CO2 ppm was much higher, than today. Plants with more recent C4 pathway (evolved around 25 million years ago), do not respond as much to CO2. https://www.sciencedirect.com/science/article/pii/S1978301916303400 https://www.sciencedirect.com/science/article/pii/S197830191...
    - ncmncm 5y ago
      For reference, corn (maize) is C4. And sugar cane. High-fructose corn syrup and cane sugar happen to represent the greatest public health disaster since smallpox was eradicated and smoking started down.

The extra carbon in the air has already made plants more productive so there’s some offset already.

IntrepidWorm 5y ago

This seems plausible, but I'm curious if you have a citation?

chrisco255 5y ago
https://www.nasa.gov/feature/goddard/2016/carbon-dioxide-fertilization-greening-earth/ https://www.nasa.gov/feature/goddard/2016/carbon-dioxide-fer...

ncmncm 5y ago

Invasive weeds and vines, mainly. Poison ivy, kudzu, and virginia creeper grow faster. Most plants cannot use all the carbon they already get. Instead, they get less able to compete as the weeds choke them.

chrisco255 5y ago
Not true at all. Most plants can use additional carbon all the way to 1000+ PPM. Some all the way to 2000PPM. Quotes below, sources below that: - CO2 increased leaf area, water use efficiency, and harvest index (in tomatoes) [1] - Optimal levels for tomatoes may be 2 to 5 times the normal atmospheric levels (1000 to 1500 ppm CO2 versus ambient levels of 350 ppm) [2] - Combining increases in CO2 with fertilization and irrigation could greatly enhance leaf area which when coupled to observed increases in net photosynthesis as a result of elevated CO2 could greatly increase productivity of loblolly pine trees. [3] - demonstrating an optimal CO2 concentration of 889.6, 909.4, and 894.2 ppm for aboveground, belowground, and total biomass, respectively, and 967.8 ppm for leaf photosynthesis (in winter wheat) [4] [1] https://www.sciencedirect.com/science/article/abs/pii/S0378377419320463 https://www.sciencedirect.com/science/article/abs/pii/S03783... [2] https://cals.arizona.edu/hydroponictomatoes/nutritio.htm https://cals.arizona.edu/hydroponictomatoes/nutritio.htm [3] https://link.springer.com/article/10.1007/s004680050111 https://link.springer.com/article/10.1007/s004680050111 [4] https://pubmed.ncbi.nlm.nih.gov/26253981/ https://pubmed.ncbi.nlm.nih.gov/26253981/
- monort 5y ago
  Elevated CO2 concentration favors plants with C3 pathway, because they appeared when CO2 ppm was much higher, than today. Plants with more recent C4 pathway (evolved around 25 million years ago), do not respond as much to CO2. https://www.sciencedirect.com/science/article/pii/S1978301916303400 https://www.sciencedirect.com/science/article/pii/S197830191...
  - ncmncm 5y ago
    For reference, corn (maize) is C4. And sugar cane. High-fructose corn syrup and cane sugar happen to represent the greatest public health disaster since smallpox was eradicated and smoking started down.