Johannes Feddema, Professor and Chair of Climatology at UVic calls the situation “unprecedented” in human history. (Don Bodger/Peninsula News Review File)

Carbon dioxide at highest levels for over 2.5 million years, expert warns of 100 years of disruption

CO2 levels rising rapidly, now higher than at any point in humanity’s history

Researchers have announced that the concentration of carbon dioxide in the earth’s atmosphere is now at levels not seen for at least 2.5 million years.

We can all now claim part of the dubious honour of living in a time no other humans have ever experienced.

ALSO READ: Top 10 Climate Change myths debunked

Carbon dioxide levels recorded at the Mauna Loa Observatory in Hawaii hit 415 parts per million (ppm) last week. This is more than 100 ppm higher than at any time in the 800,000 years of data scientists have access to on world carbon dioxide concentrations. For perspective, the last time these levels hit 300ppm, humans didn’t exist.

Scientists say while the earth has gone through periods of cooling and warming in the past, these events have taken a very long time to occur. For nearly a million years carbon dioxide levels in the atmosphere have been, on average, 280 ppm, not rising above 300 ppm or dipping below 160 ppm. In the past, global warming has happened gradually over thousand-year periods, while the latest human-caused warming event is happening over just a couple of centuries.

Johannes Feddema, professor and chair of climatology at UVic, says the rate of temperature change is alarming, but unfortunately not unexpected. He says over the 18,000 years from the Ice Age to 1900, the rate of temperature change was 0.036. During the 100-year period from 1900 to 2000, the temperature change was 0.7 – a 20-fold increase. And worryingly, Feddema says over the last 20 years, “We have almost matched that 100-year record in increase, in CO2.”

Ice cores from the Antarctic ice sheet preserve snapshots of how much greenhouse gas was in the atmosphere over hundreds of thousands of years. Readings taken from them show a dramatic increase in carbon dioxide levels at the start of the Industrial Revolution.

Over the past 10 years, the level of CO2 in the atmosphere has risen by an average of 2.5 ppm every year, hitting 400 ppm in 2013.

“It’s unprecedented, as far as human history is concerned. We’ve never seen this before,” says Feddema.

“However, from a climate science point of view this is absolutely not unexpected. What is disconcerting is that despite all the discussions we’ve had, Paris, Copenhagen, etc. [United Nations climate talks], we’re not slowing down at all and we’re on a trajectory some call business as usual, but worse. We haven’t really made any dents about doing something about this.”

ALSO READ: Slaying dragons: getting inside the minds of climate change skeptics

So why we aren’t we seeing catastrophic effects yet? Feddema makes an analogy linking the earth, covered in oceans, to a pot of water boiling on a stove. It might take a while to get going but once it starts boiling it is difficult to stop, even after turning off the heat.

“We have a certain momentum going here that even if we manage to do everything right, things are going to continue to change for a while. And a while being in the order of a hundred years.”



nick.murray@peninsulanewsreview.com

Like us on Facebook and follow us on Twitter

Just Posted

Big red treble clef proposed for downtown plaza in Salmon Arm

Idea is to pay tribute to artisans in the community

Church turns welcomes solar power as educational opportunity

Panels on Salmon Arm’s First United Church expected to produce 37 per cent of power needs

Okanagan-Shuswap weather: mix of sun and clouds, chance of showers

According to Environment Canada, showers are expected across the Okanagan tomorrow

Sicamous’ first cannabis store to open June 27

High Mountain Cannabis, located on Finlayson Street, recently received their provincial licence

Seymour Arm road to remain closed until at least early next week

Mudslides close forest service road, repairs can’t be made safely until rain stops

VIDEO: Killer whale steals fisherman’s catch off North Coast

Fishing duel results in eager orca snagging salmon in Prince Rupert

Villains and Vittles serves up mix of local history, mystery and murder

Twenty-sixth year for annual dinner theatre production at RJ Haney Heritage Village

Confusion over land ownership along Okanagan River Channel

There appears to be some confusion about ownership of two of the properties Coyote Cruises uses

UPDATED: Highway 97 near Penticton reopened after serious crash

Accident closes highway in both directions

Kelowna Rocket invited to Hockey Canada National Under-17 Development Camp

The 16-year-old was selected by the Rockets 18th overall at the 2018 WHL Bantam Draft

Fate of accused in Canadian couple’s 1987 killings in jury’s hands

William Talbott’s lawyer says DNA doesn’t prove murder

In photos: Co-op steps up for Shannon Sharp Learning Circle

Armstrong Regional Co-op donates $30,000 through

Okanagan RCMP serve up slices and support for Special Olympics B.C.

Last years inaugural campaign raised more than $12,000

Most Read