Analyze the sentiment expressed in the tweet. Is it positive, negative, or neutral? Explain the sentiment in relation to the stock mentioned.
TWEET: "Entertainment giant @Sony has joined #RE100, stepping up ambition on renewables and accelerating a clean economy… https://t.co/2hScm74PZQ

" STOCK: Sony DATE: 10/09/2018
Sentiment: (Provide sentiment here)
Explanation: The tweet sentiment is related to the stock mentioned, and it's important to interpret the context. The LSTM polarity score is -1 and the TextBlob polarity score is 0.18333333333333326.