In 2021, Congress and the Biden Administration passed the Infrastructure Investment and Jobs Act.

Proponents of the bill note the significant expenditures into alternative energy development, clean water projects, and electric grid infrastructure. The infrastructure and sustainability projects are expected to generate benefits that are significant and long lasting. The costs of these projects are expected to be significant and felt immediately. All the while, the current National Debt is approximately $34 trillion and this year's deficit over $1 trillion.

Some politicians make a point of praising the plan as promoting sustainability, some criticize it as wasteful spending. After reading Solow, from his perspective, what are his concerns for large infrastructure and environmental improvement projects promoted as "sustainable". For the Infrastructure Investment and Jobs Act to be sustainable for Solow, what conditions have to be met? Be specific regarding references to Solow's paper.