Late in the 1950s, Carson turned her attention to conservation, especially environmental problems that she believed were caused by synthetic pesticides.

Because these toxins have little effect on other organisms, they are considered more environmentally friendly than synthetic pesticides.

Its manufacturers claim it has little effect on other organisms, and is more environmentally friendly than synthetic pesticides.

This is not so for synthetic pesticides, which have been used in quantity only in the 20th century.

No synthetic pesticides, fertilizers or growth regulators are used in their ingredients.

There is growing concern around the country about the risks of exposure to synthetic pesticides in the food and the environment.

This enabled the village to be completely debt free as there has not been a need for synthetic pesticides and fertilizers.

The city will apply Anvil, a synthetic pesticide that was also used last year.

Humans ingest about 10,000 times more natural than synthetic pesticides.

How do they test for the thousands of natural and synthetic pesticides on each product?