There is a time reference confusion in the first paragraph.
Nowadays
refers to most recent events over the past week.
past few years
refers to the past 2 or 3 years. The writer should use a definite reference to time only once. It will be better to use the reference "nowadays" then end the definite statement with a period after "popularity". It creates a more confident statement.
However, that paragraph still suffers from an over- generalization as it claims that "all consumers" have started buying organic food. Since not all food shoppers have done so, the statement must indicate such a seperation through the use of hedging words such as "some people" or" a number of consumers". Over - generalization has the same meaning altering effect as an exaggeration.
The first reason is good in terms of reasoning but does not do well in terms of supporting examples. The positive effects of organic farming need to be seen through publicly known beneficial examples. Offer evidence that your claims have a real world basis. The second reasoning paragraph is a bit better explained with commonly known evidence. The last part of that paragraph though, it suffers from clarity issues due to improper sentence development. The subject is missing from the result.
An advantage v. disadvantage essay does not require a personal opinion.Therefore the concluding summary presentation is improper as it offers an unsolicited opinion. This will be the source of a heavy final score deduction. By the way, always write more than 40 words for this portion for it to qualify for a score.