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Marginal cost refers to the cost of producing one additional unit of a good or service. In the context of environmental protection, marginal costs represent the additional costs associated with implementing one more unit of environmental protection, like reducing one additional tonne of CO2 emissions or preserving one more square kilometer of land.

The extent of environmental protection measures may include a variety of actions such as the enforcement of stricter emission regulations, the preservation of natural habitats, and efforts to reduce waste and pollution. As the extent of environmental protection expands, firms and individuals are forced to invest more in resources, technologies, and practices to protect the environment. Initially, as environmental protection measures are first introduced, the marginal costs may be lower due to the adoption of relatively simple and cost-effective measures. However, as environmental protection becomes more extensive, these simple measures may not be sufficient, and more intensive and costly measures might be required.

As the extent of environmental protection expands, it is likely that the marginal costs of these efforts will rise. This is because the low-cost, easily-implemented measures are typically adopted first, leaving the more complex and expensive actions for later. For instance, it may be relatively cheaper initially to transition from coal to natural gas, but later transitions to renewable energy sources might incur higher costs. In addition, as the environmental protection measures become more aggressive and comprehensive, they may encounter diminishing returns on investment. This occurs when the environmental gains achieved from each additional unit of protection become smaller, while the cost of those additional measures increases. As a result, the marginal cost of environmental protection tends to rise as the extent expands.

In conclusion, it can be expected that the marginal costs of environmental protection will generally rise as the extent of environmental protection activities expands. This is because the more cost-effective measures will likely be implemented first, while the more expensive and complex measures will be left for later stages of expansion, leading to increasing costs associated with each additional unit of environmental protection.