What is a subsitute for yeast?!

Question: As some people have mentioned, there are wild yeasts present in the air. However, these will take much longer to act than the yeast you buy and, as the wild yeasts vary from area to area, results may not be predictable. Sourdough breads are often made by taking advantage of wild yeasts, but the process can take days (also, sourdough bread typically uses a bit of a "starter dough", which already contains yeast cultures).

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Answers: As some people have mentioned, there are wild yeasts present in the air. However, these will take much longer to act than the yeast you buy and, as the wild yeasts vary from area to area, results may not be predictable. Sourdough breads are often made by taking advantage of wild yeasts, but the process can take days (also, sourdough bread typically uses a bit of a "starter dough", which already contains yeast cultures).

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there is no substitute for yeast !

yeast is a living thing, this is the reason it has such a unique flavour...

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There really is no substitute.
You can try exposing whatever it is you're making to open air, as wild yeasts are everywhere-but the result will most likely be something inedible.
Why don't you want to use yeast? What are you doing? Perhaps with more information I could be of more help.

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Possibly double acting baking powder but it depends on your recipe.

http://www.foodforthoughtonline.net/

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There are no substitutes. However, there are other leaveners. Baking soda and baking powder (but you shouldn't use these as a substiute in bread recipe). Also, sometimes natural yeasts will infect the bread in your kitchen and it will rise.

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