To ensure South-East Asia's growing population has enough water to drink, we need to collect more rain, says Crispin Maslog.

The Red-Dead canal could take a small step forward in light of projected environmental impacts and other constraints, says Batir Wardam.

Better navigation and surveillance can help to prevent ships from damaging coral reefs and the need for expensive restoration, says Crispin Maslog.

Starting by redefining success, machines that vend clean water at low cost can solve India's drinking water problem, says entrepreneur Anand Shah.

Africa's next big science investment should target its oceans, but funding and political support need to be sustained, writes Linda Nordling.

Scientific research in India needs to integrate better with rural development issues, say Rajeswari S. Raina and Kasturi Mandal.

Despite concern over adverse impacts, deep marine mineral exploration is set to become a global industry, says geologist Chris Yeats.

The Pacific islands are surrounded by water, yet inhabitants face severe water shortages. Crispin Maslog highlights potential solutions.

A collaborative project in Ethiopia that has created climate data and tools can be applied in much of Africa, says climate scientist Tufa Dinku.

Innovation researcher Maria Clara Couto Soares calls for a new debate on expanding the reach of grassroots social innovations.

Debates around recent estimates of African groundwater storage capacity have been misguided, argue John Thomas and colleagues.

The protection of mountain ecosystems has been one of the few areas to benefit from Rio+20, says commentator Joydeep Gupta

Forecast to be underwater by 2050, the Pacific island states must plan for climate adaptation, with global support, urges Crispin Maslog.

Rio+20 must launch SDGs to guide countries through complex development challenges, argues Colombian ministry official Paula Caballero Gómez.

Conflicts over shared water resources could be mitigated through science-based environmental cooperation, argue Saleem Ali and Pamela Griffin.

Pakistan urgently needs to refine its crop yield forecasting and estimation system to improve food production, says Ibrar ul Hassan Akhtar.

Poverty, governance and population growth — not physical availability of water — are the real challenges for the continent, says Roger Calow.

World leaders must promote effective land use methods to mitigate drought, says Luc Gnacadja of the UN Convention to Combat Desertification.

Feeding South-East Asia's rapidly growing population requires a second Green Revolution, says Crispin Maslog.