Definition: In this task, you're given two sentences. Indicate if the first sentence clearly entails the second sentence (i.e., one can conclude the 2nd sentence by reading the 1st one). Indicate your answer with '1' if the first sentence entails the second sentence, otherwise answer with '0'.
Input: Sentence 1: The Antarctic ozone 'hole' is defined as a thinning of the ozone layer, over the continent, to levels significantly below pre-1979 levels. Sentence 2: The ozone hole is above Antarctica.

1