we should turn off air conditioners when we leave a room. => we can save electricity.
we shouldn't throw trash into the sea so we can save eletricity.
we should stop giving away plastic bags for free, and we can reduce plastic trash.
we should stop giving away plastic bags for free so we can reduce plastic trash.
we should recycle plastic bottles. + We can reuse glass bottles.
we should recycle things, and we can reduce land pollution.
we should reuse glass bottles, and we shound't throw trash into rivers.
we should reuse glass bottles, and we shound't throw trash into rivers.
we shouldn't throw trash into the sea. + We should help clean up beaches.
we shouldn't throw trash into the sea, and we should help clean up beaches.
we should take the bus or subway to school so, we can help reduce air pollution.
we should take the bus or subway to school so we can help reduce air pollution.
we should walk to school, .... we shoudn't waste water.
and
we should recycle things. => We can reduce land pollution.
we should recycle things so we can reduce land pollution.