In the modern world, some hope to use green rust to remove toxic metals and radioactive elements from the environment.

MSN: What green rust did long ago to the big blue ocean

In addition to income and hiring outlook, they look at the work environment, including hazards like toxic fumes or exposure to the elements, physical demands like heavy lifting, and stress factors including deadlines, competitiveness and travel.

FORBES: The Best Jobs In Health Care

Each has its own decay pattern and as they decay, they become other elements that move to other places in our bodies and can be toxic as well as radioactive.

FORBES: Fugitive Fracking Gets Bum Rap