Old Rocks
Diamond Member
And just how did you divine that conclusion?Climate change. Drought that has killed in the last few years, 100 million trees in California, and 300 million trees in Texas.Climate change - Spring, Summer, Fall, Winter.Yes.No.No, the caps are getting hotter and melting, thus making the water colder, effecting the temperatures of the jet stream and making the winters in areas affected by the jet stream colder.
NATURE CLIMATE CHANGE | ARTICLE
Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation
- Stefan Rahmstorf,
- Jason E. Box,
- Georg Feulner,
- Michael E. Mann,
- Alexander Robinson,
- Scott Rutherford
- & Erik J. Schaffernicht
Abstract
Possible changes in Atlantic meridional overturning circulation (AMOC) provide a key source of uncertainty regarding future climate change. Maps of temperature trends over the twentieth century show a conspicuous region of cooling in the northern Atlantic. Here we present multiple lines of evidence suggesting that this cooling may be due to a reduction in the AMOC over the twentieth century and particularly after 1970. Since 1990 the AMOC seems to have partly recovered. This time evolution is consistently suggested by an AMOC index based on sea surface temperatures, by the hemispheric temperature difference, by coral-based proxies and by oceanic measurements. We discuss a possible contribution of the melting of the Greenland Ice Sheet to the slowdown. Using a multi-proxy temperature reconstruction for the AMOC index suggests that the AMOC weakness after 1975 is an unprecedented event in the past millennium (p > 0.99). Further melting of Greenland in the coming decades could contribute to further weakening of the AMOC.
Trees die, fire, old age, no rain... whatever, and drought isn't global warming.
Climate Impact of Increasing Atmospheric Carbon Dioxide
J. Hansen, D. Johnson, A. Lacis, S. Lebedeff P. Lee, D. Rind, G. Russell
Summary.
The global temperature rose by 0.20C between the middle 1960's and 1980, yielding a warming of 0.4°C in the past century. This temperature increase is consistent with the calculated greenhouse effect due to measured increases of atmospheric carbon dioxide. Variations of volcanic aerosols and possibly solar luminosity appear to be primary causes of observed fluctuations about the mean trend of increasing temperature. It is shown that the anthropogenic carbon dioxide warming should emerge from the noise level of natural climate variability by the end of the century, and there is a high probability of warming in the 1980's. Potential effects on climate in the 21st century include the creation of drought-prone regions in North America and central Asia as part of a shifting of climatic zones, erosion of the West Antarctic ice sheet with a consequent worldwide rise in sea level, and opening of the fabled Northwest Passage.
http://pubs.giss.nasa.gov/docs/1981/1981_Hansen_ha04600x.pdf
The whole article at that link. Drought increases the chance of fire, and the drought was predicted as a result of the warming. And when this article was published in 1981, Dr. Hansen was labeled an alarmist. The Northwest Passage first opened up in 2007, the predicted time was in the latter part of this century. And last summer, a luxury liner went through the passage.