Yes, we should all go veggie.
It would help if everyone went vegan but it's not necessary. Just lowering our meat and animal product consumption would be sufficient. It's because of the population. Global population estimates during the 15th century is around 350-400 million people. Now it's 7 billion. A significant larger population means a significant increase in cattle to support the population. In addition to the 200 years of fossil fuel consumption since the industrial revolution, we've had a much bigger impact on global warming in two centuries than the previous 800,000 years.
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This graph shows the extent of carbon emissions in the last 200 years (red and blue lines) compared to the emissions of the last 800,000 years (green lines). The global warming from carbon emissions caused by volcanic eruptions throughout history is nothing compared to the emissions caused by humans in modern history.
