There is no doubt that meat production leaves a great carbon footprint, among other things:
Studies carried out by two Oxford University researchers, Joseph Poore and Thomas Nemecek, have shown that producing 100 grams of protein of bovine origin - with a high environmental impact - creates the equivalent of around 100 kilos of CO2 and uses 370 m2 of land.
But according to the FAO (Food and Agriculture Organisation), livestock farming is responsible for 18% of greenhouse gas emissions and 8% of world water consumption. It takes 15,000 litres of water to produce one kilo of beef.
So I would say two things:
Veganism CAN be a way to reduce your carbon footprint but it is really mostly about stoping food waste and reducing significantly meat consumption. Vegetarianism is also a way.
Veganism IS NOT enough to reach the 2°C target of the Paris agreements.
Some things you can do to reduce your carbon footprint are:
Reduce energy consumption
Reduce fossile fuel use
Reduce your digital use (carbon footprint of streaming and emails)
Buy second-hand rather than new
Avoid fast fashion
You can read more advice here: 8 Tips to Become Carbon Neutral in 2020