The ornamental design for an environmentsensor, as shown and described.
FIG. 1 is a rear, right and top perspective view of an environment sensor.
FIG. 2 is front, left and top perspective view thereof.
FIG. 3 is a front elevation view thereof.
FIG. 4 is a rear elevation thereof.
FIG. 5 is a left side elevation view thereof.
FIG. 6 is a right side elevation view thereof.
FIG. 7 is a top plan view thereof.
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is a referential view showing use thereof.
The broken lines shown in the drawings are for illustrative purpose only and form no part of the claimed design. The dot-dash lines show an unclaimed boundary which forms no part of the claimed design.