There's loads of things to worry about if you are a bear such as valuations, China, US yield curve flattening, economic woes in Europe, the recent collapse in freight rates etc. Here is an apt summary of these views from the pro's:
Things to Worry About as a Bear
Eliminated By Real Madrid, Borussia Dortmund Exit The Club World Cup
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Borussia Dortmund has completed the Bundesliga exit at the FIFA Club World
Cup today. What are the takeaways for the Black and Yellows from the
tournament?
53 minutes ago