| Title |
Perception of climate change
|
|---|---|
| Published in |
Proceedings of the National Academy of Sciences of the United States of America, August 2012
|
| DOI | 10.1073/pnas.1205276109 |
| Pubmed ID | |
| Authors |
James Hansen, Makiko Sato, Reto Ruedy |
| Abstract |
"Climate dice," describing the chance of unusually warm or cool seasons, have become more and more "loaded" in the past 30 y, coincident with rapid global warming. The distribution of seasonal mean temperature anomalies has shifted toward higher temperatures and the range of anomalies has increased. An important change is the emergence of a category of summertime extremely hot outliers, more than three standard deviations (3σ) warmer than the climatology of the 1951-1980 base period. This hot extreme, which covered much less than 1% of Earth's surface during the base period, now typically covers about 10% of the land area. It follows that we can state, with a high degree of confidence, that extreme anomalies such as those in Texas and Oklahoma in 2011 and Moscow in 2010 were a consequence of global warming because their likelihood in the absence of global warming was exceedingly small. We discuss practical implications of this substantial, growing, climate change. |
X Demographics
The data shown below were collected from the profiles of 351 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 84 | 24% |
| United Kingdom | 23 | 7% |
| Australia | 13 | 4% |
| Brazil | 9 | 3% |
| Canada | 6 | 2% |
| France | 5 | 1% |
| Sweden | 5 | 1% |
| Czechia | 3 | <1% |
| Germany | 3 | <1% |
| Other | 40 | 11% |
| Unknown | 160 | 46% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 279 | 79% |
| Scientists | 58 | 17% |
| Science communicators (journalists, bloggers, editors) | 12 | 3% |
| Practitioners (doctors, other healthcare professionals) | 2 | <1% |
Mendeley readers
The data shown below were compiled from readership statistics for 1,817 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| United States | 43 | 2% |
| United Kingdom | 13 | <1% |
| Canada | 12 | <1% |
| Australia | 9 | <1% |
| Germany | 8 | <1% |
| Brazil | 7 | <1% |
| France | 6 | <1% |
| Spain | 5 | <1% |
| South Africa | 4 | <1% |
| Other | 39 | 2% |
| Unknown | 1671 | 92% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 367 | 20% |
| Student > Ph. D. Student | 355 | 20% |
| Student > Master | 247 | 14% |
| Student > Bachelor | 179 | 10% |
| Professor | 91 | 5% |
| Other | 336 | 18% |
| Unknown | 242 | 13% |
| Readers by discipline | Count | As % |
|---|---|---|
| Environmental Science | 372 | 20% |
| Agricultural and Biological Sciences | 340 | 19% |
| Earth and Planetary Sciences | 280 | 15% |
| Social Sciences | 103 | 6% |
| Engineering | 85 | 5% |
| Other | 321 | 18% |
| Unknown | 316 | 17% |
Attention Score in Context
This research output has an Altmetric Attention Score of 848. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 11 March 2024.
All research outputs
#21,797
of 25,782,229 outputs
Outputs from Proceedings of the National Academy of Sciences of the United States of America
#662
of 103,729 outputs
Outputs of similar age
#63
of 183,708 outputs
Outputs of similar age from Proceedings of the National Academy of Sciences of the United States of America
#5
of 940 outputs
Altmetric has tracked 25,782,229 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 99th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 103,729 research outputs from this source. They typically receive a lot more attention than average, with a mean Attention Score of 39.6. This one has done particularly well, scoring higher than 99% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 183,708 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 99% of its contemporaries.
We're also able to compare this research output to 940 others from the same source and published within six weeks on either side of this one. This one has done particularly well, scoring higher than 99% of its contemporaries.