Final answer:
Agricultural expansion and commercial logging are two major factors that have led to the reduction of forests in humid continental climates, resulting in ecological and climate impacts.
Step-by-step explanation:
Two actions, events, or changes that have reduced the forests of humid continental climates include deforestation for agricultural expansion and commercial logging. Firstly, forests have been cleared for the creation of farmland, including cattle ranching and agriculture, which involves practices like slash and burn, leading to conversion of forest land to agricultural or pastoral use. This is evident in regions like Central America and parts of Southeast Asia. Secondly, commercial logging operations, which are prevalent in tropical regions of Southeast Asia and Africa, have also led to significant forest reduction as they exploit timber resources without sustainable management, eventually causing species loss and ecosystem damage. These regions have endured extensive deforestation due to economic pressures and development projects, affecting local climate and biodiversity.In conclusion, the humid continental climate zones are facing severe forest loss primarily due to agricultural expansion and unsustainable logging practices, leading to ecological imbalance and contributing to climate change.