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As Brazil’s president world leaders to the Rio+20 Earth Summit, the U.N. Secretary General Ban Ki-moon doubts on the three-day . A pre-summit draft document that is to as a blueprint for Earth’s sustainability has been criticised as being too by the U.N chief. He said in the opening meeting: “Let me be . Our efforts have not lived up to the measure of the ….Nature does not wait….Nature does not negotiate with human .” Rio+20 is so named because it has been 20 years since the last Earth Summit, which did lead to historic environmental decisions and , although not all were . Unlike Rio+20, the 1992 event was the result of years of discussion.

Many of the delegates who the opening on Wednesday said three days was far too short to out the Earth’s most important problems. Some lamented the of leaders like the USA’s Barack Obama and Germany’s Angela Merkel, saying their nonattendance out a message they aren’t worried about sustainability. World leaders are perhaps more with their re-election prospects and their country’s economic problems than the future of the planet. Ban Ki-moon told the assembly: “Rio+20 is not an , but a beginning. It is time for all of us to think and long-term….The world is waiting to see if our words will into action, as we know they must.”