Professor John Ashton's belief in car-sharing as an approach 'to deal with global environmental problems' ('Breaking the cycle', news focus, pages 14-15, 9 November), is laudable but at odds with current employment practices.

Increasingly, staff contracts are moving from fixed starting and finishing times to flexible working. Even those contracted to work set hours can find themselves working at unpredicted locations or else succumbing to the long-hours culture.

These days, it must be hard to find colleagues who share a working pattern that lends itself to car-sharing.

A better solution might be to apply today's technology in encouraging more administration staff to work from home.

Those avoiding an hour's travelling to work, even for two days each week, would gain the equivalent of 20 days per year and save around£750 a year in fuel.

Ian Chalmers Wirral