This volume is the 4th edition of the brazilian congress on co2 in the oil, gas and biofuels industries (june 28 - 29h 2018, rio de janeiro, brazil). The main objective of congress was the promotion and discussion of technical decisions associated with a decrease of co2 emissions in the process of growing the energy demand in a scenario of one of the most challenging tasks of the 21st century, greenhouse gas emission restrictions.
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