Jawaban:

1. People face environmental problems in their daily activities because they are often unaware of the impact their actions have on the environment. Activities such as driving a car, using single-use plastics, or consuming non-renewable resources can contribute to environmental problems like air pollution, plastic waste, and climate change. Additionally, the lack of awareness and education about sustainable practices can also lead to environmentally harmful behaviors.
   
2. Both suppliers and customers can contribute to environmental problems in their daily activities. Suppliers may engage in unsustainable practices like using non-renewable resources, polluting the environment, or engaging in deforestation. Customers, on the other hand, may contribute to environmental problems through excessive consumption, the use of single-use plastics, and the generation of waste. Ultimately, both suppliers and customers have a responsibility to be aware of the environmental impact of their actions and take steps towards more sustainable practices.
   
3. As an Indonesian citizen, I would advise my friends to adopt more sustainable practices in their daily lives, such as reducing their use of single-use plastics, conserving energy, and using public transportation or carpooling. Additionally, I would encourage them to participate in local environmental initiatives, such as cleaning up litter or planting trees in their community. Education and awareness-raising campaigns about the importance of environmental conservation could also help to improve the environmental quality in their community.
   
4. While an environmental project done by a school can make a positive impact on the environment, it may not be sufficient to stop deforestation on its own. Deforestation is a complex issue that involves multiple stakeholders, including government agencies, corporations, and local communities. However, school projects that promote awareness and education about sustainable practices can help to raise awareness about the importance of conservation and encourage individuals to take action towards more sustainable behaviors.