11.   The White House projections assume that federal programs other than Social Security, Medicare and Medicaid will not expand over the next decade.

12.   These projections assume that Americans will adopt the travel behavior of the generations that preceded them.

13.   Democrats prefer this estimate, which assumes that more spending will occur than the two other projections assume.

14.   That projection assumes no travel restrictions, he said.

15.   The projections assume reasonable levels of rainfall.

16.   The population projections assume gains from overseas migration will remain steady.