Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
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