There isn't rapid increase of CO2 in the atmosphere, in contrary CO2 is steadily declining in last 140 milion years. As a planet we are dangerously close to bottom survival threshold for vegetation that means if level of CO2 drops little bit more there will be less food for every living thing on this planet.
I can't understand why this isn't widely recognised and talked about. Why there is so much agenda for lowering CO2 emissions from common folks when that isn't the main problem.
I can't believe there's one sane person who is against reduction of plastic and chemical waste which is polluting our environment but this agenda should be very much distinguished from CO2 agenda. They must not be pushed on the backs of common people as parts of the same problem.
Over human history (see again
this nasa graph) there has been a consistent fluctuation of natural CO2 levels of around 180 to 300ppm between glacial and interglacial periods, except for the most recent decades where
it has rapidly increased. CO2 levels are now 50% higher than before the industrial revolution, and the rate of increase over the past 60 years is 100 times faster than prior natural increases. There’s no apparent downward trend over the past 800,000 years.
But let’s assume that 140 million year graph is correct and that overall it’s trending down. It still doesn’t forecast CO2 levels minus human emissions to reach that supposed threshold for millions of years. Even if we were to completely stop CO2 emissions today, it would still take thousands of years for CO2 to fall back just to pre-industrial levels, because the rate at which it is absorbed by natural processes is much slower than the rate we have been adding it to the atmosphere.
Agriculture and therefore human civilization is believed to have only been possible due the relatively mild climate we have enjoyed since the end of the last ice age around 12,000 years ago. Over those thousands of years and up until the industrial revolution CO2 levels gradually rose from 240 to 280ppm. In the last 200 years alone it's risen to 420ppm, and if emissions continue to increase unchecked it's forecasted to rise to above 1000ppm by the end of this century, a rate of change that took on average tens of millions of years in the graph you shared.
Plant growth has a direct relationship to CO2 levels yes, but so do things like temperature, weather, fresh water supply, insect populations etc. The impact of rising CO2 levels on these factors and in particular it's direct link to rising global temperatures, plus the ongoing depletion of topsoil health from industrial agricultural practices is expected to negatively outweigh any gains from higher plant growth due to rising CO2 levels, straining crop yields and global food supply. This will happen a hell of a lot sooner than any risk of plant reduction from much lower CO2 levels that we wouldn't even see until the next glacial period, and this now
isn't expected for hundreds of thousands of years due to (you guessed it) the rise in CO2 levels.
What is the source of that data/graph on vegetation survival threshold? I can only find a
similar graph on something called the “CO2 coalition” which is the successor to
GMI, a climate denial/skeptic think tank that was previously funded by Exxon Mobil, who
have a history of funding climate change denial as do many
others with interests in the fossil fuel industry. But I guess there's no "agenda" there.
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