$\text{1. We should clean houses and the roads around us to safe the environment.}$
$\text{2. We should not smoke or do bad things to safe the environment.}$
$\text{3. We should not burn trees to safe the environment.}$
$\text{4. We should plant more trees to safe the environment.}$
$\text{5. We should not cut down trees to safe the environment}$