No, cow farts, and, more importantly, cow belches produce methane, which is a dangerous greenhouse gas. As more and more methane gets into the atmosphere the earth becomes warmer. A global rise of...
The methane in cattle's intestinal gas is greenhouse gas and could contribute to global climate change not ozone depletion.
Cloning is in fact nothing more than identical twins. Thus, cloning of cows do not affect cows in any sort of way.
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20 to 30km above sea level.
Destruction of the Ozone Layer Part 2/2
What Cows Eat Affect Colostrum Quality
Risks of Mad Cow Disease
How Bad Ozone Affects Breathing