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Its main activities are exploration and production of crude oil and natural gas ; refining , marketing , supply and transportation ; and manufacturing and marketing of petrochemicals . The relationships between pg_am , pg_amop , pg_amproc , pg_operator and pg_opclass are particularly hard to understand and will be described in depth ( in the section on interfacing types and operators to indices ) after we have discussed basic extensions . The goal of reform should be to ensure that current arrangements in the different economic spheres of trade , finance , debt , investment , and technology mutually reinforce each other in support of equitable , rapid and sustainable growth and development . Bauer , Ph.D ., an engineer at the US Environmental Protection Agency in Washington , D.C ., has crafted a research framework for environmental sustainability research , merging engineering with ecological , public health , economic , and social visions . This way avoids the overhead of an SQL wrapper function , at the cost of more effort to prepare a custom backend executable . The agenda of the Conference itself reflects the need for greater coherence in policies towards domestic resources , international private investment flows , trade , official development assistance and debt , so that they support development .