Which of the following is an argument for defining the start of the Anthropocene?     The Industrial Revolution, because humans became less dependent on livestock and thus methane decreased in the atmosphere     The past 6000 years, because large reforestation efforts in the Northern Hemisphere sequestered carbon from the atmosphere     Post 1950 s, because of plastics, radionuclides from weapons testing, and concrete production on a large scale     Since 2001, because the United States did not ratify the Kyoto Protocol     19 years from now, because humans will have doubled the amount of anthropogenic CO2 in the atmosphere by then

The Industrial Revolution, because humans became less dependent on livestock and thus methane decreased in the atmosphere

The past 6000 years, because large reforestation efforts in the Northern Hemisphere sequestered carbon from the atmosphere

Post 1950 s, because of plastics, radionuclides from weapons testing, and concrete production on a large scale

Since 2001, because the United States did not ratify the Kyoto Protocol

19 years from now, because humans will have doubled the amount of anthropogenic CO2 in the atmosphere by then