@RovanZon @KHayhoe @HeidiCullen The scientific evidence is overwhelming that manmade climate change is modest and benign, and CO2 emissions are highly beneficial.
The major harms are all hypothetical, and mostly implausible. The major benefits are proven, measured, and very large.
@RovanZon @KHayhoe @HeidiCullen >CO2 improves crop yields and mitigates drought impacts. That's helping make famines rare for first time in history.
If you're too young to understand how important that is, count yourself blessed! Famine used to be a scourge comparable to war & disease.
@RovanZon @KHayhoe @HeidiCullen The only proven significant effects of rising CO2 levels are BENEFICIAL: rising crop yields, mitigation of drought damage, greening ecosystems, more plentiful food supplies, and the almost complete elimination of famines:
ourworldindata.org/crop-yields
sealevel.info/cereal-yield_1…
@RovanZon @KHayhoe @HeidiCullen Here's a paper, reporting the benefits:
Chun, et al, 2010:
"There have been many studies on the interaction of CO2 and water on plant growth. Under elevated CO2, less water is used to produce each unit of dry matter by reducing stomatal conductance."
sciencedirect.com/science/articl…
@RovanZon @KHayhoe @HeidiCullen In fact, eCO2 even helps pines to withstand bark beetles.
academic.oup.com/treephys/artic…
sealevel.info/Novick2012_inc…
@RovanZon @KHayhoe @HeidiCullen It's not just trees that benefit from eCO2. Virtually all crops benefit, and most of them benefit even more when under drought stress than under ideal conditions. Here's a a paper about wheat:
ncbi.nlm.nih.gov/pubmed/26929390
@RovanZon @KHayhoe @HeidiCullen You want the big picture? Well, here it is:
ourworldindata.org/famines
One Horseman down. War & Pestilence to go.
sealevel.info/Famine-death-r…
@RovanZon @KHayhoe @HeidiCullen The imagined harms of manmade climate change simply are not happening. For instance, sea-level trends haven't changed significantly since the 1920s.
sealevel.info/learnmore.html…
@RovanZon @KHayhoe @HeidiCullen Manmade climate change has not made hurricanes or other storms detectably worse, nor has it caused any other significant harms, thus far.
Here's a graph, of hurricane frequencies (which obviously are not worsening):
sealevel.info/learnmore.html…
sealevel.info/global_major_f…
@RovanZon @KHayhoe @HeidiCullen Here's a paper about it:
Lin & Chan (2015), Recent decrease in typhoon destructive potential and global warming implications. Nature Communications, doi:10.1038/ncomms8182.
nature.com/articles/ncomm…
@RovanZon @KHayhoe @HeidiCullen Here's an article about the declining frequency of strong tornadoes:
web.archive.org/web/2019033110…
@RovanZon @KHayhoe @HeidiCullen The Earth is greening, thanks to elevated CO2:
sealevel.info/greening_earth…
@RovanZon @KHayhoe @HeidiCullen Overwhelming scientific evidence shows that CO2 emissions are highly beneficial, rather than harmful. We'll never get CO2 anywhere near optimum (Cretaceous/Jurassic) levels, but the modest increase so far is helping both man and nature. NASA measures it:
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