information:classification, stylistic:style_transfer, structural:summarization, information:highlighting
Energy

The need for fuel declined in the Soviet Union from the 1970s to the 1980s, both per ruble of gross social product and per ruble of industrial product. At the start, this decline grew very rapidly but gradually slowed down between 1970 and 1975. From 1975 and 1980, it grew even slower, only 2.6%. David Wilson, a historian, believed that the gas industry would account for 40% of Soviet fuel production by the end of the century. His theory did not come to fruition because of the USSR's collapse. The USSR, in theory, would have continued to have an economic growth rate of 2–2.5% during the 1990s because of Soviet energy fields. However, the energy sector faced many difficulties, among them the country's high military expenditure and hostile relations with the First World.

In 1991, the Soviet Union had a pipeline network of 82,000 kilometres (51,000 mi) for crude oil and another 206,500 kilometres (128,300 mi) for natural gas. Petroleum and petroleum-based products, natural gas, metals, wood, agricultural products, and a variety of manufactured goods, primarily machinery, arms and military equipment, were exported. In the 1970s and 1980s, the USSR heavily relied on fossil fuel exports to earn hard currency. At its peak in 1988, it was the largest producer and second-largest exporter of crude oil, surpassed only by Saudi Arabia.