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Thirty years after Montreal pact, solving the ozone problem remains elusive.

Did the Montreal Protocol fix the ozone hole? It seemed so. With chlorofluorocarbons (CFCs) and other ozone-eating chemicals banned, many scientists said it was only a matter of time before the ozone layer recharged, and the annual hole over Antarctica healed for good.

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Thirty years after the Montreal Protocol, solving the ozone problem remains elusive.

Scientists warn of new threats to the ozone layer, including widespread use of ozone-eating chemicals not covered by the treaty.

Despite a ban on chemicals like chlorofluorocarbons, the ozone hole over Antarctica remains nearly as large as it did when the Montreal Protocol was signed in 1987. Scientists now warn of new threats to the ozone layer, including widespread use of ozone-eating chemicals not covered by the treaty.

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Zika didn't drive her from Miami Beach - but questions about the pesticide being used to stop it did.

Some Miami Beach residents are more afraid of naled, an insecticide being used to curb the spread of Zika, than the disease itself.

Zika’s arrival in Miami Beach didn’t drive away Miriam Haskell, who is pregnant with her first child. But her questions about one of the chemicals being used to combat the mosquitoes that are spreading the virus did.

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U.S. fights Zika mosquitoes with limited arsenal.

Over Wynwood, the Miami neighborhood where Zika gained a foothold in the continental United States, low flying planes have been spraying naled, a tightly controlled pesticide often used as a last resort.

WORLD NEWS | Fri Sep 2, 2016 8:17am EDT

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Zika surge in Miami neighborhood prompts travel warning.

At least 14 cases of the virus been found in the Wynwood neighborhood in Miami and have been spread by local mosquitoes there.

By PAM BELLUCKAUG. 1, 2016

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Is organic agriculture really better for the environment?

The answer isn’t always so clear-cut.

The whole point of organic agriculture is soil. Farm in such a way that your soil stays healthy — rich in organic matter, nutrients and microbial activity — and you can grow crops without the synthetic fertilizers and pesticides used in conventional farming.

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