But how much does it reduce your total carbon emissions from all food sources? Any food source, animal or plant, can have a big impact if the agricultural practices involved are not sustainable. Destroying rain forests for palm oil plantations is arguably worse than raising cattle on pre-existing grasslands and using beef tallow in place of palm oil.
It shows how eating animals and animal products is far worse. So even if we don't immediately eliminate all carbon emissions, reducing our consumption of animals can have a huge impact.