Jumps racing is not an ''extreme sport'' it's a gambling industry based on the exploitation and the certain death of horses. Shame on Racing Victoria.

Mike O'Shaughnessy, Spence

WHAT'S GOING ON AT 2CC?

Does 2CC management intend to give an explanation for the sudden departure of Mike Jeffreys? Loyal listeners now have the option of listening to the vacuous ramblings of Mark Parton, or worse still, turning over to the ABC.

Owen Reid, Dunlop

THEY'VE GOT THEIR BRIDGE

Ian Warden and Victor Rebikoff have their bridge (''$30m Molonglo bridge plan to segregate airport traffic'', 15 May, p.3).

Plaques could be erected to commemorate loyal patriots who have flown Qantas over the years, with a $100 charge imposed on each in order to start a ''Bring a doctor to Canberra'' campaign.

L. Booth, Yass

TUNNEL WOULD BE JUST AS GOOD

How about an Immigration Tunnel instead? The tunnel will cost much the same, have the same effect on pedestrian access to the southern shore none but with good signage can still serve its main purpose of poking Australia in the eye with multiculturalism and wasting real money on divisive symbols, but will not interfere with quiet enjoyment of the lake.

Chris Smith, Braddon

AEROSOL DOESN'T CUT IT

Arved von Brasch (Letters, May 18) wrote that the reason for the three decades of non-warming in the middle of last century is readily available it was man-made aerosols. How simple, and how ironic then, that his letter was published under the title ''No simple picture of the climate change process'', because the aerosol explanation does not appear to adequately explain ''global'' warming in the dirtier northern hemisphere and the cleaner southern hemisphere.

D. Zivkovic, Aranda

MORE YEARS AT GRINDSTONE

Many of those complaining about the new pension age (67) forget that they will have worked for fewer years than many who have retired at 65. When I was a boy, schools went only to year 11. Most of those who gained a tertiary qualification did so through correspondence courses while working. The average age, then, of people starting work was about 16. How different from nowadays.

D. Fopp, O'Connor