I'm aware of the solar cycling and the uncertainty of it all, but when we happen to have reached the highest temperatures recorded on Earth for the last ___ thousands of years (can't find the lecture with that figure, its data from the ice cores) and it happens to coincide with human being's industrialization, its a little too coincidental for me.fluffysquid;87000 said:Ok, fact: theres more CO2 in the atmosphere than....ever? But here is another: the sun goes through discrete phases of varying activity levels. With all well-documented shifts between ice ages and normal periods, and we dont even have their exact causes pinned down reliably?
I don't think you entirely understood what the BBC one was saying. Yes, polar bears are buoyant and amazing swimmers. However, despite being classified as marine mammals, they cannot swim indefinitely. Therefore, with ice melting they are being forced onto the land more than ever, which, as you did seem to catch, results in increasing starvation. They simply aren't adapted for hunting on landdwhatley;87000 said:As for the bears, the documentary I just saw (put out by the BBC and Animal Planet) actually stated that the bears expend less energy and have a more comfortable life during the times the artic is NOT frozen. There is a greater abundance of food and they are designed for long stays in the water. According to the film, it is during their stay on LAND that they face increasing starvation.
This is more than a little misleading, IMO. Geologists (you know, those people who collected all the data to begin with) have had a very good understanding of orbital forcing and its relationship to glacial/interglacial cycles for almost a hundred years. The historical record has become much more detailed since then via the collection of stable isotope data from glacial ice, reef carbonate and foramifera. This supports the orbital forcing model in no small way.fluffysquid;87000 said:the sun goes through discrete phases of varying activity levels. With all well-documented shifts between ice ages and normal periods, and we dont even have their exact causes pinned down reliably?