题目材料
Globally, the combination of reforestation and afforestation activities could reduce atmosphere CO2 concentrations by as much as 30 parts per million (ppm) this century. However, this potential mitigation is limited by many factors. One is the vulnerability of forests to increased disturbances, including those caused by pathogens, droughts, fires, and storms. For example, the mountain pine beetle is projected to convert 374,000 square kilometers $$(km^2)$$ of pine forest from a small net carbon sink to a large carbon source in Alberta alone, liberating 1 billion tons of CO2 into the atmosphere. Climate change is another factor that could limit the potential for carbon sequestration in forests. The mountain pine beetle in Alberta is thriving in part because of warmer minimum temperatures in the winter and warmer and drier summers. A third potential limitation is landowner behavior in private-sector forestry, including decisions on what species to plant and how intensely to manage forests. Private forestry competes economically with agriculture, urban development, and other land uses. Landowner decisions will therefore dictate the success of some climate policy efforts.
The passage suggests which of the following about Alberta?
- AIf certain projections are accurate, damage to its forests will indirectly contribute to increased concentrations of atmospheric CO2
- BIf certain projections are accurate, its forests will be less vulnerable to some pathogens in the future
- CIts forests will play an important role in future climate policy decisions.
- DIts forests have benefited from the warmer weather associated with climate change.
- EIts forests are primarily controlled by private sector forest managers.
显示答案
正确答案: A