Authorities tend to fence off what they consider the entire potential breeding area.

WSJ: Wrecked Beaches Could Aid Plovers

For example, whereas many fear that Muslim-only schools are potential breeding grounds for extremism, Muslim leaders argue the opposite.

ECONOMIST: British Muslims

The identification of molecular markers linked to loci affecting leaf morphology traits resolves conflicting hypotheses on the genetics of these complex traits and has potential for molecular breeding improvement of white clover.

FORBES: The Four-Leaf Clover Gene?

Those that cannot be sold and cannot be returned to the open moor because of the potential for in-breeding are slaughtered.

BBC: Dartmoor ponies

The report, The Use of Genetically Modified Animals, did acknowledge the potential risk from GM animals escaping into the environment and breeding with non-GM animals.

BBC: GM meat '10 years away'

Boosting genetic diversity means more and more breeding with mates drawn from other countries, with parents selected to ensure that potential pups will be born without genetic faults, like bad hips or eyes.

WSJ: Breeders of Rare Woolly Pooch

Such an approach has the potential to ease the risk of flooding and create valuable new wetland habitat for breeding birds.

BBC: Sea levels to rise dramatically

In addition to an increased potential for water and air pollution, critics say new mines would disturb large areas of land, creating breeding grounds for invasive species and harming wildlife.

FORBES: Obama Administration to Ban Uranium Mining at the Grand Canyon