1.   The leaded petrol Market is shrinking so fast that some major petroleum companies have discontinued refining leaded petrol.

2.   Shell has become a major petroleum producer from the deep waters of the gulf.

3.   The major petroleum companies have the most to gain from these developments.

4.   Until a deal was set and the legal and tax rules were clear, progress on major petroleum projects was stalled.

5.   Norsk Hydro, a major petroleum producer, now says studies have shown the proposal to be economically viable.