In my view, it is immoral simply to pursue the knowledge of how to do such things. This sort of scientific knowledge is a more dangerous tool than any moral person should be willing to bring into existence.

It -is- immoral. It is no different than if some physicist were to describe how to recreate the Big Bang for under $300 -in a paper posted on the Internet.

We all know there would be a race to see which fool would do it first.

Evolution does not fill the gap created by man made extinctions. As can be seen by studying the habitat of species wiped out, either other creatures suffer, plant life changes or usually both occur. But this is not normal evolution it is forced change by unnatural means. It would be satisfying to be able to rectify our excesses but in the long run by trying to change things back we usually cause other problems. But that does not mean we should not try because in trying we find out so much more about the what we are and how we came about. In doing this perhaps we can find other ways to stop the destruction of our planet. A good example is the reintroduction of the wolf back into Yellowstone Park which has started to restore the correct balance of the wildlife and plant life whithin that region. From these sort of programs we can watch and hopefully learn.

I feel that we should try and bring those species that man has made extinct back using thier DNA. BUT, we need to be careful on what species that we bing back and be careful to not destroy the current evolved species, by unleashing animals that will kill those modern animals off.
The other thing I worry about in the re-making of extinct species, is that their immunity systems will not have evolved to ward off the latest microbial diseases.

If we can do it, it is within the laws of nature.
If it is impossible, then it is not.
How can you argue with nature.

I think we need to look after the species (inc humans) before we bring anything back or make anything new... bring them back to what?? This mess of a world that is full of hate and anger, war and starvation, cruelty beyond measure!!!
Leave things as they are...

All Living Things
Lucretius your matter dividing, subdividing, and rejoining
The great sun shows belief of Earth scented flowers in nature
As we philosophize the centers hold of nature and harmony
Einstein’s mass of energy the strangeness of things
Alice looking through the looking glass
Engulf all nature of logic Ursula Major witness heaven
Strange terms to Hawkins theory of black holes
Lies upon the two, life and death
Comprehend each in the end when time is over
Again into ancient the soul may be they do not know
The end philosophise Lucretius, Einstein, Hawking
With fiery heat the world warms nature and harmony
Mahto

i think that bringing back extinct species and releasing them back to the wild could firstly upset the food chain, secondly bring back a few would be safe and could cause incredible discoveries like finding out wether dinosaurs became birds.