In order to reduce greenhouse gas emissions and effectively respond to global warming, some experts have suggested that tree-burning power generation should be used as a strategy to reduce carbon dioxide emissions. They believe that trees are more "carbon neutral" than coal and natural gas. The carbon dioxide produced will be absorbed by trees that have grown again in situ. Which of the following, if true, would most question the opinions of the aforementioned experts? ['Plant trees in time after cutting the trees, and the new trees will once again absorb carbon in the air, forming a stable carbon cycle.', 'Once the policy recommendations for tree-burning power generation are implemented, they may lead to deforestation and aggravate the global environmental and ecological crisis.', 'The calculation of the carbon cycle is more complicated. The carbon released by cutting trees and burning trees may not be equal to the carbon reabsorbed by planting trees.', 'The carbon emitted by cutting trees and burning trees will not be fully absorbed until the newly planted trees grow up, and there is a time lag.']