saber rattling

The saber rattling  coming from Iran has been constant:イランによる威嚇がコンスタントに続いている。
saber rattling:威嚇(剣を鳴らす）
hemisphere:半球(in this hemisphere:この半球（西半球））

human-generated:人為的な
This study blames our climate change directly on human-generated greenhouse gases.
blame:責任を負わせる
full-fledged crisis:本格的な危機

Goverment Mitt Rommeny nabbed a colorful endorsement from Donald Trump.:
endorsement:推薦
colorful endorsement:派手な推薦(人目を引く推薦）

Our team was allowed to witness the exercise play out.われわれは実地訓練に視察する許可を得た。
For the thousands of fans flooding into Indianapolis for the Super Bowl, it's Americana at its best.
exercise:訓練
From ABC News shower.