Local authorities in the Florida Keys just approved a plan for biotech company Oxitec to release more than 750 million genetically modified mosquitoes over the next two years, CNN reports.

The Environment Protection Agency approved the pilot project back in May after a years long approval process. The goal is to use mosquitoes that have had their genes altered so that female offspring die in the larval stage, meaning that populations could die off rapidly.

The target, the Aedes aegypti mosquito, can carry deadly diseases including the Zika virus, dengue, and yellow fever. But environmental rights activists are condemning the plans, raising concerns that the engineered mosquitoes could disrupt and harm nearby ecosystems.

"With all the urgent crises facing our nation and the State of Florida — the Covid-19 pandemic, racial injustice, climate change — the administration has used tax dollars and government resources for a Jurassic Park experiment," said Jaydee Hanson, policy director at the Center for Food Safety, a nonprofit advocacy group, in a Wednesday statement.

"Their evasive answers and lack of management skills are an indictment of their unprofessionalism and arrogance which speaks loudly of an unprepared regulatory process," Ed Russo, president of the Florida Keys Environmental Coalition, added.

An eight-year-old Change.org petition has received over 230,000 signatures — many of which were added very recently in response to the upcoming release — calling for the EPA to say no to Oxitec.

"The company wants to use the Florida Keys and Texas as a testing ground for these mutant bugs," the petition reads. "These GMO mosquitoes could pose major risks to fragile ecosystems like the Florida Keys and Texas and may pose risks to public health and safety."

Oxitec, the company behind the plan, shrugged off any possible negative effects after years of investigation by the EPA.

"This is an exciting development because it represents the ground-breaking work of hundreds of passionate people over more than a decade in multiple countries, all of whom want to protect communities from dengue, Zika, yellow fever, and other vector-borne diseases," Oxitec CEO Grey Frandsen said in a May statement.

Previous trials using the mosquito have shown success in killing off populations, reducing as many as 95 percent of them during a trial in a Brazilian city.

But 18 months later the population bounced right back up, as New Atlas reported last year. Even worse, the new genetic hybrids turned out to be even more resilient to future population control attempts, according to a paper. Oxitec refuted these conclusions and the paper now has an editor's note, reading "that the conclusions of this paper are subject to criticisms that are being considered by editors."

With or without genetic modification, controlling the mosquito population is challenging. The more common alternative, spraying insecticides, has shown to have its own environmental impact and high costs. It also hasn't been all that effective in curbing mosquitoes, according to CNN.

READ MORE: 750 million genetically engineered mosquitoes approved for release in Florida Keys [CNN]

More on mosquitoes: Gene-Hacking Mosquitoes to Be Infertile Backfired Spectacularly

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