Sentences with phrase «twentieth century warming does»

Not exact matches

Global warming does not mean no winter, it means winter start later, summer hotter, as Gary Peters said «The global average surface temperature has risen between 0.6 °C and 0.7 °C since the start of the twentieth century, and the rate of increase since 1976 has been approximately three times faster than the century - scale trend.»

In fact, we do in fact have NH and global temperature reconstructions over that period, which show the twentieth century warming to be much faster than the prior warming as the Earth exited the LIA.

It follows that, if they are not being dishonest, by «warm phase» they do not mean as warm as the mid to late twentieth century, but only warmer than the Little Ice Age.

Notice, for instance, that one account of the consensus (more accurate than Grimes's) holds that «most of the warming in the second half of the twentieth century has been caused by man», and does not exclude the majority of climate sceptics, who typically argue that the IPCC over estimates climate sensitivity.

The reason you don't know about it is that it was covered up in official temperature curves by a fake warming called «late twentieth century warming.»

I was looking up some minor detail about the Medieval Warm Period and discovered this weird parallel universe of people who apparently didn't believe it had happened, and even more bizarrely appeared to believe that essentially nothing had happened in the world before the twentieth century.

What they have done is to give the temperature curve an upslope called the «late twentieth century warming.»

This «new evidence» is based on a single analysis of «proxy» data (that is, data that do not come from thermometers but rather from sources like tree rings, ice cores, corals, and ocean and lake sediments) showing the twentieth century to be the warmest in the past thousand years.

The so - called «late twentieth century warming» that Hansen told us about did not happen.

However, Solanki et al made the same point as we do: «This comparison shows without requiring any recourse to modeling that since roughly 1970 the solar influence on climate (through the channels considered here) can not have been dominant» (Solanki et al., 2003), and: «Although the rarity of the current episode of high average sunspot numbers may indicate that the Sun has contributed to the unusual climate change during the twentieth century, we point out that solar variability is unlikely to have been the dominant cause of the strong warming during the past three decades.»

And remember warming temperatures globally swung upward — at least my information tells me this — in the first half of the twentieth century before World War II and the post-war industrial boom — and the second half of the century, with all of the industrial activity, didn't global temperatures remain fairly static?

I do agree that there is a modest human impact on climate, mainly clear in the latter half of the twentieth century, and mainly manifested by «mild - ing» or decrease in extremes (little warming in summer, mostly in winter) I'm not convinced that this is a good way to isolate the signal.

An average of the ice core water stable isotope timeseries from West Antarctica suggests persistent warming through the second half of the twentieth century (Schneider and Steig 2008), as do ice cores from the western side of the Antarctic Peninsula (e.g. Thomas et al. 2009).

That Yamal data did not show much of a warming for the twentieth century.

Unfortunately most people don't know this because in ground - based temperature records the eighties and the nineties are represented as the «late twentieth century warming.»

* As was recently stated in Nature, «Climate: The real holes in climate science» 463 (7279): 284 (2010): «Such holes do not undermine the fundamental conclusion that humans are warming the climate, which is based on the extreme rate of the twentieth - century temperature changes and the inability of climate models to simulate such warming without including the role of greenhouse - gas pollution.»

Hence, although the climate of northern Fennoscandia seems to have been significantly warmer during medieval times as compared to the late - twentieth century, the published composite records of northern hemisphere climate (Moberg et al. 2005) do not show a conspicuously warm period around ad 1000.

Grudd's paper (available here, open access) deals solely with summer temperatures at Lake Tornetrask in Northern Sweden, and the paper states clearly that «although the climate of northern Fennoscandia seems to have been significantly warmer during medieval times as compared to the late - twentieth century, the published composite records of northern hemisphere climate (Moberg et al. 2005) do not show a conspicuously warm period around AD 1000.»