`1.` . Students are more aware of protecting the environment. Teachers teach environmental issues at school.
`->` Students will be aware of protecting the environment if teachers teach environmental issues at school
`2.` Light pollution happens. Animals change their behaviour patterns.
`->` When light pollution happens, animals will change their behaviour patterns.
`3.` The levels of radioactive pollution decrease. We switch from nuclear power to renewable energy sources.
`->` The levels of radioactive pollution will decrease if we switch from nuclear power to renewable esaerzy axares.
`4.` The water temperature increases. Some aquatic creatures are unable to reproduce.
`->` If the water temperature increases, some aquatic creatures will be unable to reproduce.
`5.` People get more diseases. The water is contaminated.
`->` If the water is contaminated , people get more diseases
