Greenhouses are becoming more popular, but there's little research on how to protect workers

The latest agricultural census shows the number of greenhouse and nursery workers in the U.S. has grown by 16,000 in recent years. But there are no federal heat rules even as greenhouses become more popular and the number of workers in them has risen. There is also minimal research on the experiences of workers and their broader working conditions, nor on how to protect people who labor inside their often hot and humid environments. Some experts hope more research will emerge as indoor, climate-controlled growing environments likely become more popular as climatic conditions become less predictable and more extreme.