Countries will be asked this summer to sign up for 10 new sustainable development goals for the planet and promise to build green economies at the first earth summit in 20 years.

According to a leak of the draft agenda document seen by the Guardian, they will also be asked to negotiate a new agreement to protect oceans, approve an annual state of the planet report, set up a major world agency for the environment, and appoint a global "ombudsperson", or high commissioner, for future generations. Dozens of heads of state, political leaders and celebrities are expected to go to the UN's Rio+20 sustainable development meeting, to be held in Brazil in June.

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