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[–] iwar 1 points 1 points (+2|-1) ago  (edited ago)

C3 plants waste a lot more resources at higher temperatures, so any increase in photosynthesis from rising CO₂ levels seems likely to be at least cancelled out by the effects of the global warming it will cause.

Again the CO2 -> global warming hoax.

No point discussing effect of increased CO2 when you haven't even understood what causes it.

Anyway..

CO2 is used as green house growth promoter.

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[–] B3bomber [S] 0 points 0 points (+0|-0) ago  (edited ago)

Impact on food

What this means for food production may be more straightforward and less comforting than at first glance. These results are from grasses that survive and continue to grow year on year. But current cereal crops are "annual plants" that die after one season and have to be replanted.

As a result, they don't have the opportunity to build up the soil interactions that seem to have boosted growth of the C4 plants in the experiment. We can't expect that our food security problems will be solved by C4 crop yields increasing in response to CO₂ as they did in the experiment. Similarly, the eventual fall in biomass seen in the C3 plots shouldn't happen in C3 annual crops.

But, as we know, C3 plants waste a lot more resources at higher temperatures, so any increase in photosynthesis from rising CO₂ levels seems likely to be at least cancelled out by the effects of the global warming it will cause. And that's without factoring in changes to rainfall patterns such as more frequent droughts. Solutions that seem to be too good to be true generally are – and, for the moment, that still seems to be the case for the idea that CO₂ enhanced crop yields will feed the world.

Cherry picking what you want out of one section will not save your life.

Short version: food crops tend to be C4 variety including some being modified to be C4 when they are C3, it's in the article. C3 is everything else.

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[–] iwar 0 points 0 points (+0|-0) ago  (edited ago)

I didn't cherry pick, but rather it's the most important fact. If you mistakenly think CO2 increase is mainly man-made, you fail to understand the basic principle of how nature also is adaptive to and dependent on CO2.

It's absolutely wrong that "food crops tend to be C4". More than 95% of plant species and at least 80% of plant foods are C3 variety. C4 also is only of any measure in the tropics as they require temperate climate.

C3 inclues for example wheat, rye, barley, oats, rice, potatoes, algae, alfalfa, soybeans. What important foods are C4? Maize.., perhaps sugar? ..which is unhealthy and more poison than food anyway..

Crop's water use efficiency increases with higher CO2 :

https://imgoat.com/uploads/97da629b09/106664.jpg

https://imgoat.com/uploads/97da629b09/106673.png

https://theconversation.com/rising-carbon-dioxide-is-making-the-worlds-plants-more-water-wise-79427

Optimal CO2 levels for plant growth are much higher than current levels :

https://imgoat.com/uploads/97da629b09/106665.jpg

https://imgoat.com/uploads/97da629b09/106667.gif

All this is not very strange, if we understood the key issue I first commented.

CO2 is instrumental for plant growth, and always has been. Typically in earth history we have rarely been as low as current levels, and for most periods we've seen above 1000ppm. Below 150ppm we would really be in trouble as plants struggle to survive. We should be extremely grateful that nature is moving in a positive direction.

https://imgoat.com/uploads/97da629b09/106669.jpg

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[–] doginventer 0 points 0 points (+0|-0) ago 

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[–] B3bomber [S] 0 points 1 points (+1|-0) ago 

At least voat.co is back up. Now if the pain I feel would stop clouding what I'm trying to work on.

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[–] i_scream_trucks 2 points 0 points (+2|-2) ago 

Trees breath co2. More co2 more growth. More tree growth more o2. Trees are carbon sinks.

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[–] B3bomber [S] 1 points 3 points (+4|-1) ago 

Read the article.

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[–] littul_kitton 1 points 1 points (+2|-1) ago 

It turns out that plants need other fertilizers in addition to CO2.