If you love our endangered forests and trees as much as I do please sign this petition at the above link.
Here are some reasons why.....if you have seen the ubiquitus eucalyptus of California they are not native.
Some Eucalyptus species have attracted attention from global development researchers and environmentalists. Such species have desirable traits such as being fast-growing sources of wood, producing oil that can be used for cleaning and functions as a natural insecticide, or an ability to be used to drain swamps and thereby reduce the risk of malaria. Outside their natural ranges, eucalypts are both lauded for their beneficial economic impact on poor populations:22 and derided for being invasivewater-suckers, leading to controversy over their total impact.
Plantation and ecological problems
And here is some more information from Forests.org