But the long lead times they require will increasingly challenge such arrangements.

Over the later 20th century this assumption was increasingly challenged.

Both practices are increasingly challenged by lack of land and landfill space.

In the last few years, Empire - which takes on everyone, no matter how old or sick - has been increasingly challenged by commercial competitors.

Following Will's death, Connie finds her position within the hospital increasingly challenged.

Social changes increasingly challenged the old fashioned "blue laws."

Since the 1970s, traditional gender roles of male and female have been increasingly challenged by both legal and social means.

However the monophyly of the Chromalveolata has been increasingly challenged.

His belief in gradual change was, however, being increasingly challenged by black leaders who demanded immediate and decisive action.

The "good English common sense" that he said guided his thinking left him out of step when individuals increasingly challenged the authority of the police.