The Mauna Loa Observatory in Hawaii has been collecting data about the atmosphere and climate since the 1950s. The graph shows some of its findings. Atmospheric CO2 at Mauna Loa Observatory 400 380 360 340 320 1960 1970 1980 1990 2000 2010 Year Which conclusion is supported by the graph? O Climate change is a natural process. O All climate change is caused by humans. O The levels of carbon dioxide in the atmosphere have been increasing since the 1960s. O The levels of carbon dioxide in the atmosphere have been decreasing since the 1960s. Parts per million

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