The Intergovernmental Panel on Climate Change has concluded that greenhouse gases released into the atmosphere, due to human activities, have affected Earth's climate. Which of the following statements best explains the connection between rising atmospheric concentrations of greenhouse gases and the effects of climate change on ecosystems? A.
Higher levels of methane have caused increased global precipitation.

B.
Higher levels of carbon dioxide have caused a reduction in ocean pH.

C.
Higher levels of methane have caused algal blooms in lakes and streams.

D.
Higher levels of carbon dioxide have caused an increase in global photosynthesis.