The response of terrestrial vegetation to a globally changing environment is central to predictions of future levels of atmospheric carbon dioxide. The role of tropical forests is critical because they are carbon-dense and highly productive.

Apparently pristine African tropical forests are increasing in tree biomass, making them net absorbers of carbon dioxide. Is this a sign of atmospheric change, or of recovery from past trauma?

The world's poor are increasingly relying on fish, but a combination of climate change and unsustainable fishing practices could wipe out this vital protein source.

Increasingly, voices across the world are questioning the narrow approach to a single disease, especially the huge financing for AIDS over all else in basic healthcare. Though welcome and long overdue, this debate must now move further.