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Marginal benefits refer to the additional benefits received from consuming one more unit of a good or service. In this case, we are considering the marginal benefits of environmental protection, which may include cleaner air, reduced pollution, preservation of ecosystems, and improved public health.

The marginal benefits of environmental protection may change depending on several factors, such as the level of pollution, the current state of environmental protections in place, and the effectiveness of new environmental protection measures.

As the extent of environmental protection increases, more resources and efforts are devoted to preserving and improving the environment. This may lead to considerable improvements in the early stages, as even small efforts can have a big impact on heavily polluted or damaged ecosystems. However, as the extent of environmental protection continues to expand, the potential for additional improvements may become more limited. This can be due to diminishing returns - as more resources are allocated to environmental protection, the additional benefits received from each new measure may be smaller than previous measures. It might also be due to a saturation point, where all of the most effective environmental protection measures have already been put in place.

In general, it can be expected that the marginal benefits of environmental protection will fall as the extent of environmental protection expands. This is because, as more resources and efforts are devoted to environmental protection, the potential for additional improvements tends to become more limited due to diminishing returns and saturation of effective measures. However, it is essential to consider that this trend might not hold in every case, and the specific relationship between the extent of environmental protection and its marginal benefits may vary depending on different scenarios and factors involved.