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 presence of oil in the South Atlantic was first proved in 1974, but the distance and isolation of the Falklands deterred oil companies from exploring the area until the 1990s. Sentence 2: Petroleum is explored in the South Atlantic.

1