Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
The world has a surfeit of pledges, commitments and treaties. What it needs from the second Earth summit in Rio is firm leadership and a viable plan for success.
A controversial field trial of technology to mitigate climate change has been cancelled, but research continues. A robust governance framework is sorely needed to prevent further setbacks.
The US National Institutes of Health should rethink plans to limit a nationwide study of children. It must not miss a rare opportunity to probe the causes of childhood diseases.
Imperfect global biosafety standards and a threat to researchers' motivations from biosecurity concerns are among the significant risks in current flu research.