Fill in the blank: (Ngăn cách câu trả lời bằng ",")
Emissions from electricity, gas and water supply fell dramatically to only 0.5 million tones in 2007, a __________ of almost 3 million tones. While acid rain gases from the domestic sector and other industries fell gradually, the transport sector _____________ a small increase in emissions, __________ a peak of 1 million tones in 2005.
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