WMO: CO2 Concentrations Top 400 Parts per Million throughout Northern Hemisphere

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Carbon dioxide levels throughout the northern hemisphere hit 400 parts per million (ppm) for the first time in human history in April, an ominous threshold for climate change, the World Meteorological Organization said on Monday.

The 400 ppm level in the atmosphere, up 40 percent since wide use of fossil fuels began with the Industrial Revolution, is rapidly spreading southwards. First recorded in 2012 in the Arctic, it has since become the norm for the Arctic spring.

The WMO expects the global annual average carbon dioxide concentration to be above 400 ppm in 2015 or 2016. Rising concentrations of the heat-trapping gas raise risks of more heatwaves, droughts and rising sea levels.

“Time is running out,” WMO Secretary-General Michel Jarraud said in a statement.

“This should serve as yet another wake-up call about the constantly rising levels of greenhouse gases which are driving climate change. If we are to preserve our planet for future generations, we need urgent action to curb new emissions of these heat-trapping gases.”

Almost 200 governments have agreed to work out a deal by the end of 2015 to slow climate change as part of efforts to limit the average temperature increase to two degrees Celsius (3.6 degrees Fahrenheit) above pre-industrial times.

Temperatures have already risen about 0.8C (1.4F).

In April, the U.N.’s panel of climate experts said that greenhouse gas concentrations, led by carbon dioxide, would have to be kept below 450 ppm to give a good chance of achieving the 2C goal.

The level of carbon dioxide in the atmosphere is seasonal, since plants absorb more in the summer months, causing a peak in the spring. The northern hemisphere, with more human-related sources of the gas, has a more pronounced seasonal cycle.

Carbon dioxide remains in the atmosphere for hundreds of years. It is emitted by fossil-fueled vehicles and coal-fired factories and power plants as well as by natural activities such as breathing.

During the last 800,000 years, the level of atmospheric carbon dioxide fluctuated between 180 ppm and 280 ppm, and has probably not been above 400 ppm for millions of years, scientists say.

With the widespread burning of coal and oil during the Industrial Revolution, the concentration of carbon dioxide rose to about 290 ppm by the end of the 19th century.

That accelerated last century, with levels between 370 and 380 ppm by the year 2000.

About Mike Neuman

Identical twin; Long-time advocate of protection of our environment; Married; Father to three sons; Grandfather to one granddaughter; Born and raised in Wisconsin; Graduate of University of Wisconsin; post graduate degrees in agricultural economics and Water Resources Management fro UWMadison; Former School Crossing Guard for City of Madison; Bike to Work for 31 years with Wisconsin Department of Natural Resources; Retired from DNR in 2007; Biked to school crossing guard site 2 X daily for 7 years retiring in 2019; in addition to being an advocate of safeguarding our environment, I am also an advocate for humane treatment of animal, children, and people in need of financial resource for humane living. I am presently a Volunteer for Habitat for Humanity, Madison, Wisconsin. I oppose all long (>500 miles) distance travel (via fossil fuel burning) for nonessential purposes and all ownership of more than one home. I am opposed to militarism in any form particularly for the purpose of monetary gain. I am a Strong believer in people everywhere having the right to speak their minds openly, without any fear of reprisal, regarding any concerns; especially against those in authority who are not acting for the public good?in a timely fashion and in all countries of the world not just the U S.. My identical twin, Pat, died in June 2009. He was fired from his job with the National Weather Service despite having a long and successful career as a flood forecaster with the Kansas City National Weather Service. He took a new position in the Midwest Regional Office in Minneapolis. Unfortunately, Pat’s work for the NWS went sour after he began to see the evidence for concern about rising global temperatures shortly after relocating to Minneapolis, and how they appeared to effect of flooding on the Red River that flows out of Canada before entering the U.S. in North Dakota. . Pat and I conversed on a regular basis with other scientists on the Yahoo Group named “Climate Concern “ and by personal email. The NWS denied his recommendation to give his public presentation o n his research at the “Minneapolis Mall of America” in February 2000, which deeply affected h,im. I will h He strongly believed the information ought be shared with the public to which I concurred. That was the beginning of the vendetta against my brother, Patrick J. Neuman, for speaking strongly of the obligations the federal government was responsible for accurately informing the citizenry. A way great similar response to my raising the issue of too many greenhouse gases being emitted by drivers of vehicles on Wisconsin highway system, my immediate supervisors directed: “that neither global warming, climate change nor the long term impacts upon the natural resources of Wisconsin from expansion of the state highway system were to be any part of my job requirements, and that I must not communicate, nor in a memorandum to all the bureau, shall any person who works in the same bureau I do communicate with me, neither verbally on the phone, by email.

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