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
Billionaire Tanoto Deepens China Investments With $1.5 Billion New Fiber
Plant
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Indonesian billionaire Sukanto Tanoto's Royal Golden Eagle is doubling down
its investments in China with plans to build a $1.5 billion fiber
manufacturing...
16 minutes ago