Amend HB 2453 by striking Section 1 and substituting a new Section 1 to read as follows: SECTION 1. Section 164.007(f), Natural Resources Code, is amended to read as follows: (f) Bonds issued under this chapter for a purpose other than buying back or refunding general obligation bonds issued under Article III, Section 49-b, 49b-1, or 49b-2, of the Texas Constitution may not in the aggregate exceed $1 billion.