  The bulk of the carbon in our universe is produced in the triple-alpha
process in helium-burning red giant stars. We calculated the change of the
triple-alpha reaction rate in a microscopic 12-nucleon model of the C-12
nucleus and looked for the effects of minimal variations of the strengths of
the underlying interactions. Stellar model calculations were performed with the
alternative reaction rates. Here, we show that outside a narrow window of 0.5
and 4% of the values of the strong and Coulomb forces, respectively, the
stellar production of carbon or oxygen is reduced by factors of 30 to 1000.
