Success stories show that food crises can be controlled with the right tools and agricultural policies, says Sam Dryden.

Population forecasts may be based on unrealistic assumptions of demographic change in the developing world, warns Carl Haub.

The current drought in northern Kenya has deep roots in the current practices of pastoralists that need to be addressed, says conservationist David Western.

Environmental engineers Tasneem Abbasi and S. A. Abbasi warn that widespread adoption of small hydro could repeat a history of environmental damage.

A more integrated approach to managing the Lower Mekong River Basin could set an example for future river projects, say R. Edward Grumbine and Jianchu Xu.

Disaster specialists must gather and analyse data systematically to prevent human stampedes, say Frederick M. Burkle and Edbert B. Hsu.

Small-scale water solutions are a key to increasing agricultural productivity in the face of climate change, says water expert David Molden.

The current way of assessing water scarcity in Africa should be abandoned in favour of one designed for local realities, argues Richard Taylor.

Coping with climate change requires a greater understanding of the options for water storage, writes hydrology expert Matthew McCartney.

Policymakers must find flexible plans to ensure water security despite the uncertainties of climate change, says climate scientist Mark New.

Drought-tolerant crops could improve food security — if researchers take downstream adoption challenges seriously, says Travis Lybbert.

Innovative agricultural technologies can produce crops that meet climate change challenges, says ICRISAT head William Dar.

Kenyan MP and remote sensing expert, Wilbur Ottichilo, argues the time is ripe for using satellites to spot developing African droughts.

The Samoan earthquake highlights worrying shortcomings in Pacific early warning systems, says Richard Hamblyn.

The United States should boost funding for food, health and water, says Thomas R. Pickering, former US ambassador to the UN.

Nanotechnology must be effectively shared with stakeholders if it's to deliver clean water, say Thembela Hillie and Mbhuti Hlophe.

Developing world businesses must invest in nanotech research and development for clean water to stay ahead, says Mohamed Abdel-Mottaleb.

Developing countries are making good progress on nanotech for clean water, say Paulo Sergio de Paula Herrmann Jr. and José Antônio Brum.

Water shortages do not, and will not, cause wars — cooperation is the dominant response to shared water resources, says Wendy Barnaby.

Anti-drought technologies aren't enough to solve China's water shortages — better agricultural water management is essential, says Li Taige.