In his new book Waking the Giant Bill McGuire explains how global warming can trigger earthquakes, tsunamis, and volcanic eruptions by changing the pressure on the oceanic floor. There is now evidence that the end of the last ice age was followed by a 50-fold increase in volcanic eruptions. Earthquakes are obviously far more difficult to trace back before the dawn of human civilisation. If this is true it makes for some scary prospects about the ensuing decades of this century. It is probably not a coincidence that the mega quakes that happened in the last 7 years all happened in regions surrounded by deep oceans (Japan, Sumatra and New Zealand), where change in water currents and the added weight of melted glaciers have the most impact.