1. The Title should be "Norway became a global salmon behemoth. Now it's facing the consequences". It fits the character limit, why change it?
2. A lot of the conditions for Salmon farming can be drastically improved or completely eliminated if they have done it further away in deep sea rather than coast. It just cost more.
3. China is rapidly improving their Salmon Farming so there isn't much to worry about for Norway. In 10 - 20 years time half of it will be gone.
FYI it’s “dramatically improved” not “drastically improved”. Drastically has the connotation of something bad happening so it doesn’t make sense to drastically improve something, it’s like saying “horribly benefited”.
Points 2 and 3 kind of contradict themselves though, as China doesn't have access to deep sea (at least until the invasion of Taiwan or if China manage to take control of their claimed share of South China Sea).