Their work has covered several policy areas, including environmental taxation, the politics of genetically-modified food, and the effectiveness of global environmental agreements.

BBC: UK lags on riding 'green wave'

The two governments have agreed to work together in a variety of areas - including Europe, the economy and NI.

BBC: PM and Taoiseach meet in London

He called for council departments, including highways and environmental services, and health and education teams, to work together closely to take better care of public areas.

BBC: Many conservation areas 'at risk'