alexander7 said"the carbon dioxide level oscillated in a tight band, from about 180 parts per million in the depths of ice ages to about 280 during the warm periods between"
But it says earlier it is written in the article that during the summer months when there is more leaf surface the CO2 levels go down. This seems like a contradiction because during warm periods like the Pliocene the CO2 levels were the highest recorded when the leaf surface was much greater than today.
I am not a naysayer about global climate change but this does make me wonder what is really happening.
I'm no scientist but I still recall a grade school or junior high, earth science teacher imparting upon us that pollution is simply too much energy at the wrong place at the wrong time. I consider that concept even in my gardening. When the leaves fall they "pollute" the tidiness of the lawn. But then I gather them up and place them as mulch in areas without lawn so what is pollution in one moment is weed control & nutrient the next.
So it makes sense to me that since the industrial revolution, so much carbon dioxide has littered our lawn without evolution having the time to mulch it. Too much in the wrong place and the wrong time.
Could it be that not only was there more leaf surface at one time but also might it have been the qualities of those leaves. For instance, grasses only came into being about 67 million years ago and only widespread about 10 million years ago*. While within that, bamboo began to evolve just 30 million years back**.
"Bamboo minimizes CO2 and generates up to 35% more oxygen than equivalent stands of trees. One hectare of bamboo sequesters 62 tons of carbon dioxide per year while one hectare of young forest only sequesters 15 tons of carbon dioxide per year
So there can be a huge difference between plants which could account more for carbon dioxide absorption than the quantity of their leaf surface.
Add to that man made changes since the industrial revolution, the paving of available leaf surface areas ("According to a 2009 American Meteorological Study, nighttime temperatures can be as much as 14 degrees hotter in New York City than in rural areas 60 miles away
."****) and deforestation.
Maybe pollution is when we don't give evolution a chance to catch up.
"Without bamboo the land dies."~~saying