yes they are under threat people have been killing them for skin
yes the murray river is part of the murray darling basin which is under threat from dryland salinity which means the murray river would be under threat from dryland salinity.
Yes
No,they are not.
They do pose a significant threat, particularly to areas on or near the coast. In the westernmost parts of the state, not so much.
flooding is a threat in areas of Denmark such as Jutland and along the southern coast
Taj mahal is under threat because of the intensifying of river yamuna , are slowly eroding its foundations
because of wildfires
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The treaties that were signed under threat of force are known as unequal treaties. Unequal treaties are also agreements made under pressure.
Old Kilnsea is possibly the best know but there are several more. See the link below for a more complete list.
The ozone layer is under threat due to the continues use of CFCs. These CFC react with ozone and cause a number of problems.