Thanks for the answer.
Yes, I have been to that forum before. There is some information regarding that particual field.
Indeed, the field of environmental sciences seems to be overproduced in Australia. Many graduates who lack experience, fail in entering the labor market. So there is a lot of competiton even between citizens. I have not seen any company advertise a sponsorship option yet.
Well I know that Australian education is quite expensive. I got my degree for free which is nice. Still it surprises me that many people choose to pay a lot of many for a degree in a field, where there are few jobs.
I could probably be sponsored by an abattoir or by a farm, but I would really prefer working on my own field.