We should: 
  +  Plant many trees to balance oxygen and carbon dioxide.
  +  Propagate people to protect the environment, do not throw waste indiscriminately
  +Protect animal and animal 's living environment,....
  +Penalize people who throw waste indiscriminately....

  +Traveling by bicycle or public transport
  +Put garbage bins around the school yard

  + Use recycled products

  + Reduce nilon using

  +Turn off a dipping faucet

  +Collect empty bottles, waste paper and recycle

  + Turn light off when unnecessary
Clean the river and lake
We shouldn't:
  +Pollute the river,the sea,...
  + Cut down trees
  + Throw waste indiscriminately.....

  + Burn too much coal, gas, 

  + Waste power

  + Waste water

  + Oil slick

  +Throw rubbish into lakes, ponds, rivers

Nên:

-Don trash around where he lives.

-propagate people don trash.

-Planting trees around roadsides and parks.

-Do not litter indiscriminately wherever you are.

-i build a common sense and responsibility for protection: do not throw waste indiscriminately, do not discharge dirty water into ponds, do not break trees, houses, classrooms and schools must be clean and airy.

-Use natural materials

-Unplug the plug from the outlet

-Use clean energy

-Save paper

-Reduce the use of plastic bags

-Make use of sunlight

Không nên:

-Littering

-Use lots of plastic bags

-Deforest

-Indiscriminate smoke discharge

-Do not use natural materials

-Do not use clean energy

-Do not treat pollution in wastewater before being discharged into the environment

-No waste recycling

-Seeing garbage does not bother to throw in the trash

-Do not scavenge in ponds and lakes

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