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The article discusses research on tidal power at the European Marine Energy Centre (EMEC), a research area funded by the European Union and located near the Orkney Islands in Scotland. Research on tidal power as a source of renewable energy has been slow due to the expense and possible environmental harm caused by the building of barrages. Experiments at EMEC use underwater turbines designed by companies including Pulse Tidal, Minesto, and Lunar Energy. INSET: STIRRING UP CONTROVERSY.

A letter to the editor is presented in response to an article on tidal barrages by Jason Palmer in the October 11, 2008 issue.

A letter to the editor in response to an article about the Severn barrage in Great Britain published in the April 18, 2009 issue is presented.

A letter to the editor is presented in response to an article about the Severn barrage published in the April 18, 2009 issue.

Two letters to the editor are presented in response to an article about Great Britain's potential river Severn barrage.

A letter to the editor in response to the article of Fred Pearce on the implications of a Severn barrage published in the April 18, 2009 issues is presented.

Discusses the environmental effect of Cardiff bay barrage in Wales. Effect of the barrage on migrating fishes; Maintenance of fresh water to attract fish structure; Possibility of imposing fines on the harbor authority for every fish failing to migrate upriver.