Wayne Stollings wrote:
The recent CO2 concentration increase in the atmosphere.
The seasonal cycle and the average trend
Looking at the seasonal cycle, we see the true CO2 absorptive ability of the biosphere. The present 295ppm is significantly higher than the 180ppm average of the last 1.1 million years, and significantly higher than the 230ppm of the max in the range of that period. Yet you still have denialists here thinking or pushing that humans are not to blame for the malevolent climate changes of now and worse in the relatively near future. This used to be a forum free of such nonsense as spewed by snow and cotton.
Monitoring stations across the Arctic this spring are measuring more than 400 parts per million of the heat-trapping gas in the atmosphere. The number isn't quite a surprise, because it's been rising at an accelerating pace. Years ago, it passed the 350 ppm mark that many scientists say is the highest safe level for carbon dioxide. It now stands globally at 395.
So far, only the Arctic has reached that 400 level, but the rest of the world will follow soon.
"The fact that it's 400 is significant," said Jim Butler, global monitoring director at the National Oceanic and Atmospheric Administration's Earth System Research Lab in Boulder, Colo. "It's just a reminder to everybody that we haven't fixed this and we're still in trouble."
Carbon dioxide is the chief greenhouse gas and stays in the atmosphere for 100 years. Some carbon dioxide is natural, mainly from decomposing dead plants and animals. Before the Industrial Age, levels were around 275 parts per million.
For more than 60 years, readings have been in the 300s, except in urban areas, where levels are skewed. The burning of fossil fuels, such as coal for electricity and oil for gasoline, has caused the overwhelming bulk of the man-made increase in carbon in the air, scientists say.