| No. | Bet | Duration | Stakes | Predictor | Challenger |
|---|---|---|---|---|---|
| 661. | By 2020, Urban and vertical farms will replace 10% of city produce in Chicago. |
7 years 02013-02020 |
Predictions that Hubbard has challenged.
| No. | Bet | Duration | Stakes | Predictor | Challenger |
|---|---|---|---|---|---|
No Challenges submitted. |
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