What does Saccharomyces cerevisiae (Baker’s yeast) need to survive?

Food (Sugars)

Explanation:

S. cerevisiae feeds on sugars for energy, in the process producing carbon dioxide and alcohol (this is fermentation in a nutshell). The carbon dioxide bubbles get trapped in the dough, creating the lift that makes the dough rise. The alcohol, meanwhile, evaporates when baking, transforming into gas that also contributes to the rise of the bread. The alcohol, along with acids produced during the fermentation process, impart that wonderful flavor and aroma associated with yeast-leavened breads.

Fossil fuels when released float to the upper atmosphere and trap heat coming from the sun (simply). The earth will continue to heat until it is no longer bearable (about 10 years, this shall be interesting.)