1.   It slammed down with a violent impact upon a desk in the first row.

2.   Population growth has and will have a profound impact upon world food demand.

3.   The Ashby Report did not make a dramatic impact upon the Eastern District, but it was important none the less.

4.   The fact that such technology has already had a major impact upon the leisure industry should not fill us with wild joy.

5.   The reader should endeavour to keep up to date with oil Market developments because of their impact upon the international economy and financial system.

6.   The steam age, with its dramatic impact upon the landscape, begins effectively in the early nineteenth century.

7.   The structure of taxes and transfer payments can have a significant impact upon the distribution of income.

8.   This period of upheaval was to have an epoch-making impact upon the whole structure of Muscovite society.

9.   Unemployment, therefore, exerted a powerful, but short-lived, impact upon trade unions and the pattern of industrial relations.

10.   Vernadsky tallied up the billions of organisms on Earth and considered their collective impact upon the material resources of the planet.