It would help if you read the article which explicitly states that more than 40% of the emissions come from fuel production. Agricultural emissions can be managed by changing the diet of the animals.
Changing our own diet is on the table too... considering we don't need to eat cattle to survive. This problem is one of overconsumption, and isn't going away by keeping our lifestyle the same.
Well managed cattle herds can sequester carbon in the top soil. There is absolutely no need to go vegetarian to save the planet.