When people say infrastructure they usually mean roads. Roads are perhaps overextended already and making more or bigger roads ends up subsidizing urban sprawl. Anyways, outside of interstates, roads could just be handled entirely at the state or local level and paid for via use taxes. If we are trying to combat global warming, not building more or bigger roads is an easy place to start.
- Water delivery (pipelines, aqueducts, reservoirs, wells, desalination plants, etc.)
- etc.
This is consistent with Wikipedia's definition of "hard infrastructure" (as opposed to "soft infrastructure", which focuses on institutional structures/organizations).
