Student or Learner
What does 'further' mean?! Is it adverb or adjective?!
"The pie chart shows that there are four main causes of farmland becoming degraded in the world today. Globally, 65% of degradation is caused by too much animal grazing and tree clearance, constituting 35% and 30% respectively. A further 28% of global degradation is due to over-cultivation of crops. Other causes account for only 7% collectively."
It's an adjective. It means that the 28% they are talking about there is different from the 65% they had just talked about. 65 + 28 + 7 = 100