Their advantage to the purchaser is that they give a reassuring impression of longevity to what is essentially a brand-new operation, since they have documents extending back years.
The dispute's roots extend back three years.
Observations of nitrate deposits in ice cores reveal individual large SEP events and extend back ∼400 years.
But the critique concerning Iraq does not extend back 27 years.
Fish Hg measurements are available over shorter time scales but in some cases extend back 40 years or more.
The assessment of exposure for cancer studies in China is likely to be challenging because the estimates should ideally extend back 10-20 years to account for latency, though PM2.5 was not routinely monitored in most Chinese cities until 2012.
What our reconstruction of temperatures showed was that the recent warming was outside the range of the natural variations that we saw, eventually that we were able to extend back to 1,000 years– that there was no precedent in our entire 1,000 year reconstruction for the warming of the past century.
Damages, however, can extend back only three years and into the future.
In Egypt, the first lists date from about the middle of the 3rd millennium bce and extend back another 1,000 years to a time when kings were thought to mingle with gods.
By eschewing the rigors of academic study, Jóhannsson's taste remained mutable and dynamic, open to creative forces that extend back hundreds of years.
Now, there is greatly improved agreement between techniques, there are 20-year records of profiles of stratospheric H2O and of total NO2 at single sites, there is a qualified H2O record extending back 40 years and 12-year records of total NO2 from many sites, and there are reliable global measurements from satellites to form the basis of climatologies.
