One of the major threats to the environment is posed by the extraction of bitumen from the Alberta oil sands. With one of the world's largest bitumen deposits, Alberta currently is benefiting from the oil sands. Yet, this mining operation poses three major environmental challenges to Alberta, Canada, and the world. What are they?
a) Air pollution, noise pollution, and deforestation
b) Soil erosion, water contamination, and habitat destruction
c) Greenhouse gas emissions, water usage, and habitat preservation
d) Land subsidence, radiation exposure, and overgrazing