May 2017  global temperature update (belated)

May 2017 global temperature update (belated)

I update the GISTEMP records every month, but I missed writing up April’s monthly summary. Real-world events have set my priorities elsewhere and this May 2017 write-up is a couple of weeks overdue. Monthly updates are probably overkill anyway, especially when there are no dramatic changes taking place.

Here is how May’s monthly global average looked relative to all months since January 1998.

monthlymay17

May 2017 was the second-warmest May anomaly ever and was in the top 16 22 or so of all months ever recorded. Continue reading

New publication: Does it matter if the consensus on anthropogenic global warming is 97% or 99.99%?

New publication: Does it matter if the consensus on anthropogenic global warming is 97% or 99.99%?

Cross-posted at Skeptical Science

The 97% consensus on anthropogenic global warming (AGW) reported by Cook et al. (2013) (C13) is a robust estimate. Alternative methods, such as James Powell’s, that identify only explicit rejections of AGW and assume that all other instances are endorsements, miss many implicit rejections and overestimate the consensus.

The C13 method can be modified and used to estimate the consensus on plate tectonics in a sample of the recent geological literature. This limited study—not surprisingly to anyone familiar with the field—produces a consensus estimate of 100%. However, among the abstracts that expressed an opinion. only implicit endorsements of the theory were found: this underlines the importance in consensus studies of identifying implicit statements. The majority of the abstracts expressed no position. Assuming that these cases suggest either uncertainty about, or rejection of, plate tectonics (as some critics of C13 have claimed about AGW) would lead to the absurd conclusion that the theory is not widely accepted among geologists.

Opinion surveys show that the public is misinformed about true state of consensus among climate scientists, with only a minority aware that it is greater than 90%. The difference between 97% and 99.99% is tiny compared to this gap. The 3% of published papers that reject AGW are contradictory and have invariably been debunked. They do not therefore provide a coherent alternative account of climate science. Despite this, dissenters are awarded disproportionate attention by ideologically and commercially motivated interests, as well as by false balance in the media. Countering this public confusion requires both communicating the consensus and debunking bad science.

For a shorter summary than the one below, read Dana Nuccitelli’s Guardian piece: Is the climate consensus 97%, 99.9%, or is plate tectonics a hoax? Continue reading

The Globe and Mail “clarifies” its misleading oil sands article

A bungled correction to a Globe and Mail article reveals that the intent was to publish a puff piece on the oil sands, not an objective analysis of the future of bitumen production in the face of serious climate change mitigation.

Just over two weeks ago, I wrote a piece critical of an article in the Globe and Mail: Environmentalists should end the charade over the oil sands, written by Martha Hall Findlay and Trevor McLeod. I also contacted the editor at the G&M to alert him/her of the errors in the piece. I revisited the G&M article recently and found the following note at the bottom.

Eds Note: This version clarifies references to the IEA’s outlook for oil to 2040.

I didn’t keep a copy of the entire original article, so I can’t be sure of all the updates they made, but I did cite the problematic first paragraph of the original piece (the words that were later removed are marked with a strikethrough):

The story starts with global energy forecasts. Even if there is very aggressive adoption of electric vehicles and renewable energy technologies – which we wholeheartedly support – the world will use more oil each year through at least 2040. According to the International Energy Agency (IEA), if the world goes beyond the aggressive commitments made in Paris and achieves the 2C global goal, then oil demand would fall by 2040. Yet, oil demand will remain high for years after that.

The “clarified” version follows, with  text underlined

The story starts with global energy forecasts. Even if there is very aggressive adoption of electric vehicles and renewable energy technologies – which we wholeheartedly support – most forecasts, including two of the three International Energy Agency (IEA)’s scenarios, predict that the world will use more oil each year through at least 2040. According to the IEA’s third forecast, even if the world goes beyond the aggressive commitments made in Paris and achieves the 2C global goal, which many analysts doubt, then oil demand would fall before 2040. Yet, even in that most aggressive scenario, oil demand will still remain high for years after 2040.

I suppose it’s fairly standard for newspapers to try to save face by claiming to “clarify” rather than “correct” a piece. However, in this case they also introduced new errors and added confusion.  Continue reading

Global temperature update: February 2017

Global temperature update: February 2017

NASA’s GISTEMP temperature estimates for February 2017 are now out.  February 2017 was the second-warmest February since records began (the first-warmest being in 2016) and was tied for the fourth-warmest monthly anomaly for any month.

Here is a plot of all monthly anomalies since 1998. I have coloured the lines for the three recent record years of 2014, 2015 and 2016.

gistempfeb17monthly

We are currently not in El Niño conditions, so it is rather extraordinary that the temperatures are running so warm—warmer in fact than during any El Niño before 2016. The average temperature this year so far, 1.01° C, is warmer than the record-breaking annual average for 2017 of 0.98° C. This does not mean that 2017 will set a new record: it’s possible, but not likely, as I will try to show. Continue reading

Keeping oil sands in the ground is not a “charade”

Keeping oil sands in the ground is not a “charade”


If the world is successful in reducing emissions sufficiently to avoid dangerous climate change, there is a limited future for a prospering oil-sands sector in Canada. The conventional wisdom among the Canadian establishment is that growing the oil-sands business is compatible with meeting national and global emissions commitments. This is a myth that obscures government policy contradictions.

In a recent Globe and Mail article Environmentalists should end the charade over the oil sands, Martha Hall Findlay and Trevor McLeod argue that keeping oilsands in the ground and stopping new oil pipelines will actually increase global greenhouse gas emissions.

Their argument rests on two premises:

  • Oil demand won’t start to fall until 2040. After that it will remain high for many years.
  • Oil-sands production is becoming less emissions intensive thanks to improving technology. If oil-sands consumption by US refineries were replaced by, say, more emissions-intensive Venezuelan heavy crude, then global emissions would increase.

I won’t dispute the second point in detail, at least for now. The case I’m making here does not depend on rebutting it. If overall oil-sands upstream emissions intensities really are falling due to improved technology, that’s welcome news. But I haven’t seen the most recent average emissions data that back it up. My understanding is that newer projects are predominantly in-situ facilities that are more emissions intensive than mines, so that the average GHG emissions per barrel is actually rising slowly.

My focus here will be the first point, where Hall Findlay and McLeod made an important error by misrepresenting the scenarios from the IEA’s World Energy Outlook 2016. They wrote: Continue reading