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About 1,000 years ago average temperatures were about 1 degree higher than today (which makes our concern about an 0.4 degree rise since 1980 rather minor).
About 2,100 years ago average temperatures were about 2 degrees higher than today.
About 3,300 years ago average temperatures were about 3 degrees higher than today. (The data from Greenland ice-cores goes back far beyond this time so despite what some people say, it looks like it takes a lot more than 3 degrees to melt the ice cap!)
For almost all of the last 4,000 years temperatures have been higher than today. More precisely, apart from a brief period 1200 years ago, it is only the last 750 years that have been at or below current temperatures. On this evidence it is more reasonable to assume that warmer weather is the natural condition - in so far as we can claim any stability or consistency in something that is constantly changing.
Originally posted by np6888
reply to post by wx4caster
According to wiki, the average temperature has risen over the past "century," compared to the 2000 years before that. This is pretty good proof of global warming, as it encompasses the Earth's cooling and warming cycles, which revolve in decades.
Also, out of 180+ nations, all but one country signed the Kyoto Protocol, which calls for a reduction in the greenhouse gases emissions. Guess which country that was that didn't sign?
So either we must assume that the U.S is wrong, or the rest of the countries are, hmm...
It's actually quite amazing if you think about it. The U.S is like the big kid who likes to bully people around. Too bad he also has all the guns, so no one can do anything about it.
news.bbc.co.uk...
Scientists in Bolivia say that one of the country's most famous glaciers has almost disappeared as a result of climate change.
The Chacaltaya glacier, 5,300m (17,400 ft) up in the Andes, used to be the world's highest ski run.
But it has been reduced to just a few small pieces of ice.
Many Bolivians on the highland plains, and in two cities, depend on the melting of the glaciers for their water supply during the dry season.
The team of Bolivian scientists started measuring the Chacaltaya glacier in the 1990s. Not long ago they were predicting that it would survive until 2015.
But now it seems, the glacier has melted at a much faster rate than they expected.
Photos taken in the last two weeks show that all that is left of the majestic glacier, which is thought to be 18,000 years old, are a few lumps of ice near the top.
Originally posted by np6888
reply to post by wx4caster
So you're saying that wiki and the other 180 countries are all conspirators?
For the purposes of this comparison, the author is agnostic as to which, if any, of the reconstructions of global mean temperature is an accurate reflection of temperature fluctuations during the last 2000 years. However, since this plot is a fair representation of the range of reconstructions appearing in the published scientific literature, it is likely that such reconstructions, accurate or not, will play a significant role in the ongoing discussions of global climate change and global warming.