If the expectation is for the future rate to be markedly different from the current rate, what's the cause?

Paris 1.5°C target may be smashed by 2026: A change to a positive ...
https://www.sciencedaily.com/releases/2 ... 184929.htm
May 8, 2017 - A change to a positive phase of the Interdecadal Pacific Oscillation ... These were both periods that saw rapid increases in global average .

"Even if the IPO remains in a negative phase, our research shows we will still likely see global temperatures break through the 1.5°C guardrail by 2031," said lead author Dr Ben Henley.

"If the world is to have any hope of meeting the Paris target, governments will need to pursue policies that not only reduce emissions but remove carbon from the atmosphere.

Global carbon dioxide emissions surged to record levels the year after the landmark 2016 Paris climate agreement was signed.

Energy-related emissions climbed 1.4 percent to 32.5 gigatons in 2017, the International Energy Agency reported yesterday in its annual survey of global carbon levels. The increase is the equivalent of adding 170 million cars to the road, the agency said.

The uptick—coming on the heels of the major international climate deal—signals an abrupt end to several years of stagnant emissions growth and raises questions about the world’s commitment to reducing carbon levels.

“It’s not good news,” said Rachel Cleetus, policy director for the climate and energy program at the Union of Concerned Scientists. “It certainly is a sign that we have a great deal of work to do to meet the commitments that countries made in Paris to limit emissions and the harmful effects of climate change.”

Macdoc wrote:OK

If the expectation is for the future rate to be markedly different from the current rate, what's the cause?

You didn't read the paper did you? Just dismissed it as crank. Nor did you read the IPCC 1.5C report where the graph indicates 2034 without taking into account the decadal oscillation which could shift that forward into late 2020.

Climate Change and Extreme Summer Weather Events – The Future is still in Our Hands
Filed under: Aerosols Arctic and Antarctic Climate impacts Climate Science Greenhouse gases heatwaves — mike @ 31 October 2018

A Grave Climate Warning, Buried on Black Friday
In a massive new report, federal scientists contradict President Trump and assert that climate change is an intensifying danger to the United States. Too bad it came out on a holiday.

Most significantly, the National Climate Assessment—which is endorsed by nasa, noaa, the Department of Defense, and 10 other federal scientific agencies—contradicts nearly every position taken on the issue by President Donald Trump. Where the president has insisted that fighting global warming will harm the economy, the report responds: Climate change, if left unchecked, could eventually cost the economy hundreds of billions of dollars per year, and kill thousands of Americans to boot. Where the president has said that the climate will “probably” “change back,” the report replies: Many consequences of climate change will last for millennia, and some (such as the extinction of plant and animal species) will be permanent.

Upcoming Live Events (all times Eastern)

Friday, Feb. 6, 11:30 a.m.: Media teleconference on 2018 global temperatures. Live streaming audio of the teleconference will be available on this page. Climate experts from NASA and the National Oceanic and Atmospheric Administration (NOAA) will provide the annual release of global temperatures data and discuss the most important climate trends of 2018. The teleconference participants are:

Gavin Schmidt, director of NASA's Goddard Institute for Space Studies in New York
Deke Arndt, chief of the global monitoring branch of NOAA’s National Centers for Environmental Information in Asheville, North Carolina

Drone surveys have revealed erosion of coastal permafrost in the Arctic — up to 3 feet a day. Researchers reported Friday that the recent rate of erosion is six times higher than the historical rate.

Meanwhile, the Arctic just saw the hottest May on record, with temperatures in northwest Russia hitting a remarkable 84 degrees Fahrenheit (29 degrees Celsius). Global warming is driving Arctic sea ice to near-record lows, which in turn is driving ever-worsening summer heat waves in the southern United States, according to another new study.

The sweltering heat in the Bay Area on Monday shattered multiple decades-old records, caused a meltdown of the BART system and left thousands of people without electricity.

It got so hot, BART trains experienced major delays systemwide during the evening commute when the heat caused trackway equipment problems.

chango369 wrote:Arctic Permafrost Melting 70 Years Sooner Than Expected, Study Finds

meltingpermafrost.jpg

The continuous accumulation of carbon dioxide in the planet's oceans—which shows no sign of stopping due to humanity's relentless consumption of fossil fuels—is likely to trigger a chemical reaction in Earth's carbon cycle similar to those which happened just before mass extinction events, according to a new study.

MIT geophysics professor Daniel Rothman released new data on Monday showing that carbon levels today could be fast approaching a tipping point threshold that could trigger extreme ocean acidificationsimilar to the kind that contributed to the Permian–Triassic mass extinction that occurred about 250 million years ago. 

Rothman's new research comes two years after he predicted that a mass extinction event could take place at the end of this century. Since 2017, he has been working to understand how life on Earth might be wiped out due to increased carbon in the oceans.

Rothman created a model in which he simulated adding carbon dioxide to oceans, finding that when the gas was added to an already-stable marine environment, only temporary acidification occurred.

When he continuously pumped carbon into the oceans, however, as humans have been doing at greater and greater levels since the late 18th century, the ocean model eventually reached a threshold which triggered what MIT called "a cascade of chemical feedbacks," or "excitation," causing extreme acidification and worsening the warming effects of the originally-added carbon.

Over the past 540 million years, these chemical feedbacks have occurred at various times, Rothman noted.

But the most significant occurances took place around the time of four out of the five mass extinction events—and today's oceans are absorbing carbon far more quickly than they did before the Permian–Triassic extinction, in which 90 percent of life on Earth died out.

The planet may now be "at the precipice of excitation," Rothman told 

Disappearing sea ice is changing the whole ecosystem of the Arctic Ocean

I drafted this while looking north over the frozen Lincoln Sea, at the northernmost tip of Ellesmere Island in Canada. I was at Alert, a Canadian Forces Station which, at 82°N, is the most northerly permanently inhabited place on Earth. Just 815km away, across the Arctic Ocean, lay the North Pole.

It was May, and the sea should have still been frozen, but this year the bridge of sea ice between Ellesmere and Greenland broke up early, and Arctic ice began flowing down the narrow Nares Channel and south into Baffin Bay. All across the Arctic Ocean, the amount and persistence of sea ice is declining – September ice cover has fallen around 30% since 1980.

The Arctic is warming at twice the rate of the rest of the planet, and images of polar bears on small ice floes capture the imagination. But those images represent (excusing the pun) only the tip of the iceberg – the consequences of ice loss are profound and start from the very bottom of the food chain, in the microbial processes that drive the biology of the ocean.