World Environment Day was established by the United Nations General Assembly in 1972 to mark the opening of the Stockholm Conference on the Human Environment.

BBC: NEWS | Science/Nature | Changing planet revealed in atlas

However, Labour AM Mark Drakeford, who chairs the assembly's health committee, said that was "the slogan of rogue employers in every industry that you can think of".

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But he will not be the only politician making his mark on the Maes a Welsh Assembly First Minister Rhodri Morgan is expected visit the site every day.

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Newly-elected members of the assembly managed to make an immediate mark - visibly unencumbered by the City Hall fatigue or Boris-blindness which may have set in elsewhere in the ranks.

BBC: Boris Johnson quizzed by London Assembly

Mark Durkan wants to test how seriously the government responds to assembly votes on policies like water charges.

BBC: NEWS | UK | Northern Ireland | Preparations for 'virtual assembly'