 Complete the following phrase:  On 1619 May 2011, more than twenty Nobel Laureates, several leading policy-makers and some of the worlds most renowned thinkers and experts on global sustainability met for the Third Nobel Laureate Symposium on Global Sustainability at the Royal Swedish Academy of Sciences in Stockholm. The Nobel Laureate Symposium concluded with the Stockholm Memorandum, calling for strengthening of Earth System Goverce as a priority for coherent global action. This memorandum has been submitted to the High-level Panel on Global Sustainability appointed by the UN Secretary General and fed into the preparations for the 