freediver wrote on Mar 25
th, 2007 at 9:59am:
By what definition? "Unsustainable=harvest of natural resources"?
You are correct, saying that all harvesting is unsustainable is wrong, but I believe in this particular case it is not very likely with our less than adequate understanding of ocean ecosystems.
Finding a definition for what is a 'sustainable' harvest is one problem, knowing how much taken away will effect the ecosystem is another. Our understanding of nature is so feeble and we are repeatedly shown to have done damage where we thought we had learned and found a better way to do things.
Sustainability means taking only at a rate that allows natural stocks to continue to grow. How do you account for all factors when harvesting species such as whales? With such a large animal as the whale, how do we account for all the effects they have on the total ecosystem? How do we know how many calves will grow to become mature whales? How do we allow enough time for young to mature? When have we ever been able to harvest from the sea at a sustainable rate, especially species that are so low in numbers? All of this despite billions of dollars and untold hours of painstaking research... we still do not understand well enough.
freediver wrote on Mar 25
th, 2007 at 9:59am:
You prefer commercial agriculture? The complete destruction of terrestrial ecosystems?
Yes, it is not perfect but it is important that we have some areas left undisturbed by human activity and farming at least allows this. It is also a more controlled scenario in which it is easier to rectify our stupid habits when we become aware of them. A sustainable future means we will need a combination of more intensive controlled regions of agriculture, balanced by free wild regions - we have never been able to control the complexity and randomness of nature, I doubt we ever will.
History has shown that where we harvest from nature for food, we degrade the ecosystem, farming has proven a rather successful long term solution to this. A lot of the degradation due to farming has actually come about in very recent history due to the use of chemical fertilisers, machinery, monoculture and such. I agree that destruction of forest to clear land has been terrible for the environment, but this can be balanced out, there are many highly sustainable farming methods out there they are just not put into practice (this is changing though).
Fish farming is more difficult and has caused lots of damage to the environment, but fish farming is in its infancy compared to agriculture, I believe we will gain more insights the more we do it.
freediver wrote on Mar 25
th, 2007 at 9:59am:
Yes it is. For starters, there is the whole 'private ownership difficulty.'
You are absolutely correct. But as a fisho I think you must agree with me that commercial fishing has done untold damage to the ocean ecosystems over the last hundred years or so? Why would whaling be any different?
Technically, hard to say how it can be controlled, but the current methods seem to at least do something? Something needs to be done about commercial fishing, we can't just sit here and say it cannot be stopped until the ocean floors are swept clean now can we? Or can we?