Not really. They are soft stones, even for jewelry, but the mining of them may be causing problems.
It is not an environmental issue, it is a public health issue
But it is water that is a major environmental issue.
Garbage is the disposal of unwanted or undesired material or substance. It is an environmental issue.
Nobody MADE opals. They're mined out of the ground.
Environmental issue are subjects problem or controversies that relate to impairement or improvment for the zika.
Opals cannot be used as foods. They are hard, precious stones.
Most have an environmental officer aboard.
economic issue, equality issue and environmental concerns
food security is an environmental issue arising from major environmental changes hence requires an integrated food system approach, not just a focus on agricultural practices.
Neither opals or any other gemstone will make you invisible.
Some opals are known as black opals, this is when they have a mainly black colour. In general a black opal is very dark blue and has flecks of other colours within
Industrial pollution