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A new figure environment can be opened in Matplotlib.pyplot by calling the plt.figure() function. It creates a new figure with default settings and returns a figure object, which can be used to customize the plot according to the user's requirements.

For example:

import matplotlib.pyplot as plt

# Open a new figure environment
fig = plt.figure()

# Plot the data
plt.plot([1, 2, 3, 4], [1, 4, 9, 16])

# Show the plot
plt.show()

This code will open a new figure environment, plot the given data on it, and show the plot to the user.