Question: Which of the following observations has been made regarding anthropogenic climate change? Select all that apply. Which of the following observations has been made regarding anthropogenic climate change? Select all that apply. precipitation has become more variable with some areas experiencing an increase in droughts and others experiencing an increase in flooding crop yields for major food staples have suffered as climatic variables such as temperature and precipitation have changed volcanic and anthropogenic inputs of aerosols, including pollutants from burning fossil fuels, have slightly offset the effects of warming caused by increased amounts of greenhouse gases in our atmosphere sea surface temperatures have increased and oceans have become more acidic there has been a shrinking of glacial ice due to melting in polar areas the most extreme variations in climate and accelerated warming have been observed in equatorial regions