Environmentalist: If global production of single-use plastics continues to rise exponentially, then within the next century the mass of plastic in the oceans will rival that of marine life. Some commentators claim this outcome can be avoided because chemists are close to perfecting fully biodegradable plastics. That advance, however, would offer only a brief reprieve. If production keeps doubling every 20 years, and if by 2050 all single-use plastics manufactured are biodegradable and completely break down within 10 years, then by 2060 the total amount of plastic in the oceans would again equal the amount that existed in 2050.
Which one of the following most accurately expresses the conclusion drawn in the environmentalist's argument?