Monday, 20 May 2013

Getting Warmer




Climate change and global warming have been one of the big debates of the last decade - although it has got a little overshadowed by the great debt meltdowns since 2008. However, since none of us live in a vacuum, I think we can still safely say that climate change - natural or assisted - is impacting on us one way or another...just like it did to the Romans. The Romans? Really? Well, they lived in the climate too, and just as the woolly mammoths found out, nothing stays the same forever. In fact the Roman-era is the only other point in history where we can see man made atmospheric pollution spiking in ice cores. Did they change the climate? Look, I doubt the evidence is there to say that, but the absolute peak of the Roman economy does coincide with the warmest period measured for the last 2200-years. A report published in Global and Planetary Change using Scandinavian tree rings has found that the mean temperature between the years 27-56AD was a full one degree Celsius warmer than today. This is a time when more people lived in Britain than during the Elizabethan age. And after a long decline, there is a sudden dip between 299 and 328AD to almost a degree cooler than today, which coincides with the breaking up of the Roman Empire into the Eastern and Western Empires as their economies collapsed under the weight of inflation, invasions and civil violence. Another little gem the graph shows is the last century of the Roman Republic coinciding with a climate recovery from a very sharp cooling period which bottomed out around 110BC. Apart from the five Roman civil wars that followed this cold snap, 110BC also marks - almost to the year - the mass migration of more than one million Cimbri and Teutons from modern day Denmark. Some ancient writers said these German tribes were driven south by floods that had destroyed their arable lands. They would spend the next decade devastating Gaul and several Roman armies. Victims of climate change? It would seem so.

Tomorrow we'll look at some of the reasons the climate changed in Roman times. And guess what? It might just involve greenhouse gases. For more on the ancient Danes you can read 'A Body of Doubt' - available from Amazon, just follow the links