Change the following sentences in direct speech to reported speech

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1. Change the following sentences in direct speech to reported speech.
Nam said, "The environment is severely affected by pollution".
Nam
Mai said, "The burning of fossil fuels leads to air pollution."
Mai
"Intensive insecticide and pesticide sprays in agriculture make the soil contaminated.", Peter said.
Peter
4. Tony said, "The disposal of untreated sewage in rivers and oceans leads to water pollution."
5.
Tony
Mary said, "Loud and annoying sounds from unnumerable vehicles in the highway nearby cause noise pollution."
Mary
6. Lan said, "The rising sea level is a product of global warming, a natural phenomenon. The only unnatural thing
about global warming is the accelerated rate at which it is happening."
Lan
Linda said, "Environmental pollution is an impact of human activities on the environment."
Linda