A pledge to increase support for biodiversity targets in developing countries is welcome, but care for indigenous people is vital too.

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

The climate change debate offers a way to integrate forest management into development policy, but strategies must be informed by good science.

Almost unnoticed, Nepal is developing simple and cheap technologies that make the best of local resources and don't damage the environment.

The political effect on the United States of its failure to anticipate Hurricane Katrina's full impact will hopefully generate a more considered attitude to the threat of climate change.