[A] abruptly [B] account [C] accumulation [D] cited [E] confirm

[F] confronting [G] emissions [H] encouraging [I] energy [J] gradually

[K] identify [L] increase [M] outstanding [N] recovering [O] released

According to new government figures, pollution levels are rising again after several years of gradual decline.

Data【C1】_____on Friday by the Energy Department show American factories and power plants put more carbon dioxide into the atmosphere during the first six months of 2014 compared with the same period in each of the past two years. The figures【C2】__a reversal first seen in 2013, when the trend of steadily falling emissions【C3】_____halted.

The higher emissions are primarily a reflection of a【C4】_____economy, as American businesses burned more gas and oil to meet higher demand. But the shift also highlights the challenge【C5】_____the administration as it seeks to honor a pledge to sharply cut U. S. emissions of greenhouse gases by the end of the decade.

Administration officials said the【C6】_____was not particularly surprising given the improving economy, and some pointed to one of the report’s bright spots: Even as the economy expanded, carbon【C7】_____from automobiles have remained essentially flat, as more Americans switched to fuel-efficient cars and trucks.

Some also cited another【C8】_____trend in the report: big jumps in the use of alternative and renewable【C9】__. Solar, wind and hydropower were up more than 7 percent compared with two years ago, according to the report, and renewable sources now【C10】_____for nearly 12 percent of the country’s domestic energy production.

【C5】