Because one of the biggest problems from raising animals for food is methane which is the gas they produce. Methane is also one of the biggest problems that people produce too by the way and one of the biggest contributors to global warming even more in it's own right than CO2. So, the more people that choose plant based proteins over meat or fish proteins the less bad Global Warming and Global Climate change will tend to be.
Another advantage of plant based proteins is that plants and trees produce oxygen from CO2 whereas Animals and human produce CO2 from oxygen when we breathe out. Without enough plants and trees humans won't be able to breathe anymore or animals either because there will be nothing there to make oxygen anymore because the seas are slowly dying so they won't produce oxygen at some point the way things are presently going.
By the way Diatoms in the ocean produce 50% of the air we breathe and without them we only have trees and plants to produce oxygen after that. So, the more we can encourage the oceans and diatoms not to die through global warming the better off future humans and animals are going to be. IF the water gets too hot or polluted or acidic the diatoms will all die.
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Jun 10, 2014 - Tiny diatoms are beautiful, plentiful and surprisingly mysterious when ... About 20 percent of that oxygen comes from photosynthesis by marine diatoms — the ... will produce complete genomes for several more diatoms and ...
Jan 26, 2008 - During photosynthesis, diatoms turn carbon dioxide into organic carbon and, in the process, generate oxygen. ... Scientists since the late 1990s have found only a handful of genes that influence diatom shell formation. The work with Thalassiosira pseudonana identified large, previously unknown subsets.
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