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le (28m0s)

Climate Models: learning from the Past Long-Term Climate Variability

Projections of future climate change rely on global climate models. Such models simulate the dynamics and physics of the coupled atmosphere-ocean system and move towards models of the full Earth system. These models are evaluated on the present day mean climate as well as on climate variability over the last century. Although climate models agree on the overall patterns of future climate change, discrepancies are still displayed between models, both in amplitude and at the regional scale (e.g., IPCC AR5 (2007)). Past climates offer an unique opportunity to evaluate climate models on climate conditions different from the present-day conditions ...
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le (1h11m11s)

Computers are Not Omnipotent

In 1984, TIME magazine quoted the chief editor of a certain software publication as saying: "Put the right kind of software into a computer, and it will do whatever you want it to. There may be limits on what you can do with the machines themselves, but there are no limits on what you can do with software." This talk will survey results obtained over the last 80 years by mathematicians, logicians and computer scientists, which disprove this ignorance-based statement in a sweeping and fundamental way. We shall discuss problems that are provably non-computable, as well as ...
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