The logs of Lord Nelson and Captain Cook....
More evidence of natural warming and cooling of the earth...
Scientists have uncovered a treasure trove of meteorological information contained in the detailed logs kept by those on board the vessels that established Britain's great seafaring traditition including those on Nelsons' Victory and Cook's Endeavour.
Every Royal Naval ship kept a detailed record of climate including air pressure, wind strength, air and sea temperature and major meteorological disturbances.
A group of academics and Met Office scientists has unearthed the records dating from the 1600s and examined more than 6,000 logs, which have provided one of the world's best sources for long-term weather data.
Their studies have raised questions about modern climate change theories. A paper by Dennis Wheeler, a geographer based at Sunderland University, recounts an increasing number of summer storms over Britain in the late 17th century.
Many scientists believe that storms are caused by global warming, but these were came during the so-called Little Ice Age that affected Europe from about 1600 to 1850.
The records also suggest that Europe saw a spell of rapid warming, similar to that experienced today, during the 1730s that must have been caused naturally.
"British archives contain more than 100,000 Royal Navy logbooks from around 1670 to 1850 alone," Mr Wheeler said. "They are a stunning resource. Global warming is a reality, but our data shows climate science is complex. It is wrong to take particular events and link them to carbon dioxide emissions.