Being a vegetarian or a vegan is nothing new but the push towards a plant-based diet for more people world-wide has taken on added importance because of global warming.

Companies that make meat-food are racing to create the best meat-free burger.

It is all part of an effort to reduce reliance on farmed animals, which contribute significantly to greenhouse gas emissions.

Al Jazeera’s Rob Reynolds reports from Redwood City, California.

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