What are some concerns of using GMOs?

Answer 1

GMOs are not caused, but produced. GMO is the abbreviation for Genetically Modified Organism. Basically, the process of genetic engineering removes a section of DNA from one organism, often a bacteria or virus, and inserts it into another organism, often a crop like corn or soybeans. The majority of genetically modified crops have been modified to withstand direct spraying of synthetic weed killers, or to produce a substance within the plant itself that kills insects when insects feed on the plant.

The use of this technology is controversial, but to answer your question directly, many would say the "cause" is economical for the producers of the GMOs, since when they modify a crop genetically, the modified plants are considered unique organisms that can be (and are) patentable.

Answer 2

Some concerns of using GMOs are: unknown effects on the environment, not having the technology to reverse any harmful effects on the environment caused by the use of GMO crops, unknown effects on animal and human health, lack of sufficient long-term and human studies on GMO foods, etc.