With the global community gearing up for World Health Day, informal dialogues can build partnerships to drive health policy.

Last week's summit has confirmed that sustainable development will only be achieved through the political leadership of developing countries.

The message from Rio+20 is for practical action to deliver existing targets. Scientists must identify and overcome barriers to change.

Efforts to promote sustainable development must tap into technologies developed locally, driven by community needs and priorities.

The shortage of credible and diverse voices in science undermines the capacity of journalists to respond to development challenges.

A meeting in London this week will show whether science can not only diagnose our environmental crisis but also provide effective solutions.

The recent riots in the United Kingdom have shown the dark side of social media. But we must avoid heavy restrictions on their use.

Government attempts to control science communication clash with public demands for accountability, and journalists must resist this trend.