To help protect the environment, which practices should be observed?

The principle of "Reduce, Reuse, Recycle" is widely recognized as an effective approach to environmental conservation. This practice encourages minimizing waste generation (reduce), making the most out of existing materials (reuse), and properly processing materials to recover resources (recycle).

By reducing consumption, individuals and businesses can lower the amount of waste produced and lessen the environmental impact associated with manufacturing new products. Reusing items prolongs their life cycle and reduces the need for new materials, which in turn conserves resources and energy. Recycling involves taking materials that would otherwise become waste and processing them into new products, which helps conserve natural resources and reduces pollution.

In addition to being a straightforward guideline for waste management, these three actions collectively contribute to a sustainable environment, making it easier to protect ecosystems and reduce harmful environmental effects.

The other choices do mention concepts related to environmental protection, but they do not encapsulate the well-established and widely promoted framework that "Reduce, Reuse, Recycle" represents. Each of the alternatives lacks the holistic approach that the correct answer provides, emphasizing a widely accepted methodology for safeguarding the environment.