This actually talks about the difference in the gas emission in the past and the current time. in 1990s the livestocks emission which means the gas emitted as a pollutant was in great amount untill 1990 but reduced afterward. however do you due to the beef cattle number it started again rising ( the emission of pollutant from livestock) the beef cattle number was increasing as the sheep were less in number. So the sheep was replaced by selling of cattle beef.
The other part of the sentence talks that if we reduce the useless domestic animal which is not very useful it will help to take down the emission. So it focus on saying to replace by animal or livestock which will yield or give profit and is high in nutrition so the gas emission reduces.
The bullwhip effect is a distribution channel phenomenon in which demand forecasts result in inefficiencies in the supply chain. (Got this off from Wikipedia)
Cupid was considered a symbol of love by ancient Roman myths. It was believed that is Cupid shot you with his arrow you would fall in love with the first person you saw.
The purpose of a Venn diagram is to show all of the possible relations between a finite collection of different sets. Basically, it's compare and contrast.
