Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture the tweeter's mental state.
Tweet: Paul Ehrlich said that humanity is a threat to all life. Such great news to start the day. If I could blush I would.
This tweet contains emotions: 
anger, disgust, sadness