Concentration of CO2 in atmosphere hits record high: UN

The Greenhouse Gas Bulletin, the UN weather agency's annual flagship report, tracks the continent of dangerous gasses in atmosph
The Greenhouse Gas Bulletin, the UN weather agency's annual flagship report, tracks the continent of dangerous gasses in atmosphere in the post-industrial era (since 1750)

The concentration of carbon dioxide (CO2) in the atmosphere has hit a new high, the UN said Monday, warning that drastic action is needed to achieve targets set by the Paris climate agreement.

"Concentrations of in the surged at a record-breaking speed in 2016," the World Meteorological Organization said.

"Globally averaged concentrations of CO2 reached 403.3 parts per million in 2016, up from 400.00 ppm in 2015 because of a combination of human activities and a strong El Nino event," it said.

The Greenhouse Gas Bulletin, the UN weather agency's annual flagship report, tracks the continent of dangerous gasses in atmosphere in the post-industrial era (since 1750).

The report also said that the last time Earth experienced similar CO2 rates was three to five million years ago, when the sea level was up to 20 metres (66 feet) higher than now.

"Without rapid cuts in CO2 and other , we will be heading for dangerous temperature increases by the end of this century, well above the target set by the Paris climate change agreement," WMO chief Petteri Taalas said in a statement.

The historic agreement approved by 196 countries two years ago is facing renewed pressure following US President Donald Trump's decision to quit the accord.

But nations are set to press on with the task of implementing it at climate talks in Bonn next week.

"The numbers don't lie. We are still emitting far too much and this needs to be reversed," the head of UN Environment Erik Solheim said in a statement, reacting to the new report.

"What we need now is global political will and a new sense of urgency."

The Greenhouse Gas Bulletin tracks concentrations of gasses in the atmosphere, rather than emissions with data compiled from a monitoring station in Mauna Loa, Hawaii.


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Concentration of CO2 in atmosphere hits new high: UN

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Oct 30, 2017
The Greenhouse Gas Bulletin tracks concentrations of gasses in the atmosphere, rather than emissions with data compiled from a monitoring station in Mauna Loa, Hawaii.


Global CO2 level is assumed to be constant with a reading at a single monitoring station at Mauna Loa, Hawaii?

Oct 30, 2017
The Greenhouse Gas Bulletin tracks concentrations of gasses in the atmosphere, rather than emissions with data compiled from a monitoring station in Mauna Loa, Hawaii.


Global CO2 level is assumed to be constant with a reading at a single monitoring station at Mauna Loa, Hawaii?


It is measured by satellite data and currently 23 ground based TCCON sites around the world. Mauna Loa is used as a calibration and validation point because it's the longest on-going sampling site.

The sites measure the spectrum of sunlight as it passes through a column of air, so they basically sweep through an arc from horizon to horizon as the sun moves. The satellites do a similiar thing with sunlight reflected off the ground.

Oct 30, 2017
Nope no satellites are used in this measurement; mostly ground based only (see acknowledgement):

https://ane4bf-da...WxgWAJHa

So the measurement resolution is spotty at best. We just have to wait for rightly calibrated satellite data and wait for 100 years or so to be able to draw the right conclusions.

Oct 30, 2017
Site mentioned above: https://preview.t...y84dtdcw


Oct 31, 2017
The numbers don't lie. We are still emitting far too much

Really? What's "too much"? 400 ppm is near the low end of the very wide range that humans and other organisms can tolerate (up to several thousand ppm) with no adverse effects. Also the EU Joint Research Centre reports that global CO2 emissions have stalled for the last 3years.

https://ec.europa...year-row

Meanwhile trees and plants are happy with the "too much" CO2. It's food for them and has resulted in greater plant growth; the "greening of the earth" as some say. It's certainly not hurting agriculture, or anything else for that matter. But you would never know that from all the science deniers who keep screeching about CO2 causing most of the paltry 1° C warming in the last 100 years, a postulate that still remains to be proved.

Oct 31, 2017
Meanwhile trees and plants are happy with the "too much" CO2. It's food for them and has resulted in greater plant growth; the "greening of the earth" as some say. It's certainly not hurting agriculture, or anything else for that matter.


There will be no "greening" in Australia if CO2 levels keep rising - quite the opposite. Australia faces a (much) hotter future. Maybe aksdad you live in a cold (currently) northern country that can tolerate more heat, but most of the world will be adversely affected by temperature rises and not just because of rising sea levels.

Nov 04, 2017
400 ppm is near the low end of the very wide range that humans and other organisms can tolerate (up to several thousand ppm) with no adverse effects


Human cognitive performance starts to decline at 800 ppm.


Nov 07, 2017
https://skeptical...food.htm

The idea that unprecedented increases in Co2 levels will increase plant growth are unsupported. There is no need to argue against facing climate change. It is more than possible to be both politically conservative and to accept the scientific consensus.

Nov 07, 2017
400 ppm is near the low end of the very wide range that humans and other organisms can tolerate (up to several thousand ppm) with no adverse effects


Human cognitive performance starts to decline at 800 ppm.



And that's before we get into the impact of the extra warming. We have catastrophic climatic changes between 1-2 degrees, societal collapse between 2 and 4, and human extinction somewhere after 4. We're currently on track for a rise of 4-7 degrees by 2100. We could hit 2 degrees by as early as 2030 with our current level of emissions.

Nov 07, 2017
People don't quite get how much extra heat a rise of 1 degree C means over the whole atmosphere. It only seems like a little bit, but it's an enormous amount of heat because it's the atmosphere over the whole planet. All that energy has to do something, and it does.

Nov 08, 2017
People don't quite get how much extra heat a rise of 1 degree C means over the whole atmosphere. It only seems like a little bit, but it's an enormous amount of heat because it's the atmosphere over the whole planet. All that energy has to do something, and it does.


Apart from the funded denial team that are paid to spread disinformation, a lot of this is caused by a poor statistical and scientific education. People don't really understand what a global mean is or what that means for regional climatic changes. April cyclones, mega hurricanes, record flooding, flash freezes. We're seeing this at only 1 degree. I can't even imagine what 1.5 is going to look like.

A cold Arctic keeps North America and Europe temperate. Sea levels are moderated by Antarctic ice sheets. The network of global currents at specific temperatures keeps weather consistent. Human civilisation has based its settlements around these things. If they change by even a small margin... game over, man.

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