[1/4]FILE PHOTO: Participants are seen in silhouette as they look at a screen showing a world map with climate anomalies during the World Climate Change Conference 2015 (COP21) at Le Bourget, near Paris, France, December 8, 2015. REUTERS/Stephane Mahe/File Photo Acquire Licensing Rights WASHINGTON (Reuters) - U.S. diplomats should sidestep questions from foreign governments on what it would take f