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### Question 1
# Brief Explanations:
The first blank refers to the natural surroundings, so "environment" fits. The second blank is about the belief in protecting nature, which is "Environmentalism".
# Answer:
1. environment; Environmentalism

### Question 2
# Brief Explanations:
The EPA stands for Environmental Protection Agency. It was created by President Richard Nixon's executive order in 1970.
# Answer:
2. Environmental Protection Agency; Richard Nixon

### Question 3
# Brief Explanations:
In 1973, the EPA started phasing out lead in gasoline due to its environmental and health hazards.
# Answer:
3. lead

### Question 4
# Brief Explanations:
Burning fossil fuels releases carbon dioxide ($\ce{CO_2}$). Plants (producers) remove $\ce{CO_2}$ from the air through photosynthesis, where they convert $\ce{CO_2}$ and water into glucose and oxygen using sunlight.
# Answer:
4. Carbon dioxide (or $\ce{CO_2}$); plants (or producers); photosynthesis

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