Accelerated global warming could lead to a runaway methane global warming effect due to the release of methane currently trapped in unstable methane hydrate deposits in the arctic that could be destabilised by accelerated global warming effects.Core samples taken from old ocean sediment layers have been used to trace back in time the climate changes that have occurred over the past tens of millions of years. By analysing the incidence of different fossil shell remains of sea creatures occurring in these sediments it is possible to track the changes in the sea water temperatures and levels of atmospheric CO2 occurring More >