Foto: Třeskuté mrazy v USA

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A man walks his dog across Lake Harriet near Minneapolis (background) January 23, 2013. The Upper Midwest remains locked in a deep freeze, with bitter sub-zero temperatures and wind chills stretching into a fourth day across several states due to waves of frigid Arctic air. REUTERS/Eric Miller (UNITED STATES - Tags: ENVIRONMENT) Published: Led. 23, 2013, 8:04 odp.
Americká zima. | Foto: Reuters