The UN held Earth Summit 2012 in Rio last year - Rio+20. This was a conference of governments looking at the implications of the way in we use the Earth and options for the future in terms of economy, poverty, education, population, health, environmental pollution, habitat and biodiversity loss and many other issues. It resulted in a range of major commitments from governments on sustainable development, which are being tracked both by the UN on the Sustainable Development Knowledge Platform and by the NGO Stakeholder Forum on the SD 2015 website with a range of reviews and insights.
This is a complex policy area with many different elements and a lot of diverse governmental, intergovernmental and NGO actors. Rio+20 is a successor to the 1992 UN Conference on Environment and Development (also in Rio) - and that in turn was a successor to the 1972 UN Conference on the Human Environment in Stockholm that firmly established an international agenda for the environment and its human dimensions.
The UK House of Commons Environmental Audit Committee has just reviewed the outcomes of Rio+20 - with additional evidence. It has also produced an updated report on the effectiveness of the UK government with respect to sustainable development policy.
The NHM hosted a series of Earth Debates last year that drew in an international audience to discuss a range of issues: videos are available to let you see the discussion again.