Certain toilet paper, tissue and office paper brands are made with materials from eucalyptus trees, a non-native species to Portugal. CNN PortugalThe problem is eucalyptus trees are particularly flammable. The eucalyptus tree is native to Australia and provides food and shelter to koalas, among other wildlife. As the Portuguese paper and timber industries grew in the mid-1900s, so too did eucalyptus plantations, and the species now covers nearly 2 million acres. In California, the eucalyptus tree has been naturalized, meaning it now grows beyond the places it was planted.

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