Are We Seeing Global Warming?

@article{Hasselmann1997AreWS,
  title={Are We Seeing Global Warming?},
  author={Klaus Hasselmann},
  journal={Science},
  year={1997},
  volume={276},
  pages={914 - 915}
}
Measurements over the last century show that the global mean temperature has increased by about 0.5 degrees C. But how much, if any, of that increase can be attributed to human activity is uncertain and highly controversial. In his Perspective, Hasselmann discusses recent efforts to untangle anthropogenic climate change from natural climate variability. Improvements in computer modeling have reduced the scatter in climate change simulations from 50 to 20%, but significant differences remain. To… Expand
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References

SHOWING 1-10 OF 11 REFERENCES
Climate response to increasing levels of greenhouse gases and sulphate aerosols
CLIMATE models suggest that increases in greenhouse-gas concentrations in the atmosphere should have produced a larger global mean warming than has been observed in recent decades, unless the climateExpand
Human Influence on the Atmospheric Vertical Temperature Structure: Detection and Observations
Recent work suggests a discernible human influence on climate. This finding is supported, with less restrictive assumptions than those used in earlier studies, by a 1961 through 1995 data set ofExpand
Recent warming in global temperature series
Global mean temperature can be estimated from surface and from tropospheric measurements. Much has been written recently concerning trends in the various time series over short (10–15 year) periods.Expand
Towards the detection and attribution of an anthropogenic effect on climate
It has been hypothesized recently that regional-scale cooling caused by anthropogenic sulfate aerosols may be partially obscuring a warming signal associated with changes in greenhouse gasExpand
A search for human influences on the thermal structure of the atmosphere
The observed spatial patterns of temperature change in the free atmosphere from 1963 to 1987 are similar to those predicted by state-of-the-art climate models incorporating various combinations ofExpand
Estimates of low frequency natural variabilit in near-surface air temperature
Estimates of the spectrum of natural variability are critical to the problem of detecting an anthropo genic signal in global climate observations. Without such information it is impossible to sayExpand
ENSO variability and atmospheric response in a global coupled atmosphere-ocean GCM
Abstract. The interannual variability associated with the El Niño/Southern Oscillation (ENSO) cycle is investigated using a relatively high-resolution (T42) coupled general circulation model (CGCM)Expand
Global Surface Air Temperature Variations During the Twentieth Century: Part 1, Spatial, Temporal and Seasonal Details
This paper is an up-to-date review of instrumentally-recorded, seasonal, surface temperature change across the land and marine regions of the world during the twentieth century. This is the firstExpand
Hemispheric Surface Air Temperature Variations: A Reanalysis and an Update to 1993.
Abstract Land-based compilations of gridded monthly surface air temperature anomalies, averaged into hemispheric values for the last 140 years, have been available for climatological analyses for theExpand
Detecting greenhouse-gas-induced climate change with an optimal fingerprint method
Abstract A strategy using statistically optimal fingerprints to detect anthropogenic climate change is outlined and applied to near-surface temperature trends. The components of this strategy includeExpand
...
1
2
...