How long can we continue growing sugar cane in coastal lowlands with a rising sea level?

The land we are farming is between 0.50 and 1metre AHD, so much of the rain that falls has to be pumped out over the levies. Even though the land is very low it is also very productive and is well above the Australian average, producing 100tph each year with the Australian average at 77tph. The property has a dewatering pump with a capacity of 4 megalitres per hour. One pump is automatically set to start at -50cm and shut down at -60cm AHD. The farm has been laser graded to drain to a central point. We plan to install another 4 megalitre pump to enhance the drainage. We plant our cane on raised beds, which gives us another 20cm before there is damage to the cane.

By cutting the cane with out burning and retaining the residue we have been able to reduce the shrinkage of the landscape previously measured at 1cm per year to almost zero. The predictions of sea level rise of between 50cm and 1 metre by 2100 may be underestimated as science shows that in the last millennium a 1degree C increase in temperature resulted in a sea level rise of around 20 metres.

I believe that if we can slow the warming of the planet my grandchildren will be able to continue to live and farm this property as my family has for the last 120 years.