Mình làm outline cho bạn tham khảo nha chứ mình lười viết bài văn lắm :)))

Topic 1: 

- Our environment is being damaged, so we should have some urgent solutions to protect it.

- Firstly:

+ we shouldn't use too many fossil fuels because they are non-renewable resources.

+ make use of alternative energy such as solar energy, wind energy,...

- Secondly:

+ planting more young trees to have green lungs around us.

+ Trees can absorb carbon dioxide and release oxygen ⇒ helpful for our health.

- Thirdly:

+ Stop using plastic bags because they're difficult to dissolve.

+ (Instead/However,...) Bags, which an environmentally friendly are good substitutes.

- Last but not least:

+ Stop deforestation for farming and housing.

+ If there is no forest, humans will face a lot of disasters: flood, drought,.....

Conclusion: We should protect our environment; therefore, we ought to encourage people to have awareness of protecting our "green environment".

Topic 2: To save electricity we should:

- Turning off the lights when we go out of the room.

- Take a shower instead of taking a bath ⇒ saving the water.

- Making use of solar energy or energy panel to heat the water, (instead of heating water with an electric kettle)

- To reduce the consumption of fossil fuels, we should go to school by bike.

⇒ We should join hands to save energy now by anyways that we can for a bright future. 

Good luck!