"It's extraordinary that the Lib Dems are still claiming that they will protect green spaces when they plan to concrete over our countryside with thousands more houses on green field sites, " she said.

BBC: Nick Clegg

Tomorrow, my fellow ministers and I will meet with business leaders from the United States and other APEC economies to work on concrete, practical measures that will help to level the playing field across the region.

WHITEHOUSE: Our Top Stories

It comprised a wide range of educational activities including field trips to enable students to explore various World Heritage sites and to take stock of concrete sustainable development issues.

UNESCO: Education