Baby boomers are aging and leaving the workforce. Not enough people are expected to replace them to meet the higher demand for infrastructure workers to rebuild America's roads, bridges, airports, rail, and other infrastructure. US president Biden' $1.4 trillion investment planned for renovating infrastructure will mean a large demand for workers that will be difficult to meet, says this report in NYT. Fewer students are going into community colleges, and fewer new workers are replacing older workers who retire in the construction related industries.