By 2020, the number of steelworkers in the US will have dropped by more than half.
The manufacturing industry has been losing ground, in part because of advances in manufacturing processes.
But the pace of progress is accelerating.
This week, the US National Steelworkers Union announced that it was planning to double its annual steelworker membership to 500,000.
It has seen its membership swell from 5,000 in 2015 to 12,000 this year.
“We’re seeing the biggest impact on steelworkers, and it’s because the industry has grown more rapidly than we expected,” says John Condon, director of the Industrial and Labor Relations Board (ILRB).
“In 2015, the industry saw just 5% growth, and by 2020, it will see a 60% growth.”
In other words, the steel industry is now about 10% bigger than it was five years ago.