1.  A global concerted effort is required to avert a global health crisis.

2.  I feel that I should make a more concerted effort to leave my profession and find a new and more satisfying career.

3.  It will take a concerted effort to change the culture of binge-drinking in the country.

4.  Libraries have made a concerted effort to attract young people.

5.  Meanwhile, ministers rallied in a concerted effort to denounce rumours of a rift between Mr Lawson and Margaret Thatcher.

6.  She has also made a concerted effort to improve her knowledge.