One year ago, a toxic chemical leak at a DuPont plant in La Porte, Texas killed four workers, including grandmother Crystle Wise. A massive leak of 23,000 pounds of methyl mercaptan erupted in the plant’s pesticide manufacturing building in the early morning hours of Nov. 15, 2014, and Wise and other co-workers died when they were overcome trying to stop the leak.

During one of his early morning shifts, Jose Melena stepped into a 35-foot-long oven and began loading pallets of canned tuna at a Bumble Bee Foods plant. Not realizing Melena was inside, fellow employees shut the machine door behind him and turned on the oven. With temperatures reaching about 270 degrees, he was cooked to death.

On Aug. 12, an industrial accident in Tianjin, China killed at least 114 people – including 21 firefighters – and injured roughly 700 more residents. Another 70 people, including 64 firefighters and six policemen, are still listed as “missing.” It is just the most recent example of the catastrophes that can occur when countries don't have adequate safety requirements for industrial facilities.

In April 2013, an explosion at a fertilizer plant in West, Texas killed 15 people, injured more than 200, and levelled nearby homes and schools. President Obama visited West in the aftermath and promised to improve our nation’s chemical safety laws. On Aug. 1, 2013, he issued an executive order directing federal agencies to revise their chemical safety policies to ensure that a West-type tragedy never happens again. But two years later, are we any safer?