import matplotlib.pyplot as plt # Initalize a Figure and Axes ____ # Plot the CO2 variable in blue ax.plot(____, ____,

下面是完整代码： ```python import matplotlib.pyplot as plt # Initalize a Figure and Axes fig, ax = plt.subplots() # Plot the CO2 variable in blue ax.plot(climate_change.index, climate_change["co2"], color="blue") # Create a twin Axes that shares the x-axis ax2 = ax.twinx() # Plot the relative temperature in red ax2.plot(climate_change.index, climate_change["relative_temp"], color="red") plt.show() ```