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The noosphere is a philosophical concept that describes the sphere of human thought and consciousness that envelops the Earth. It suggests that as humanity develops, a new layer of organization emerges, distinct from the geosphere (inanimate matter) and the biosphere (living organisms). This noosphere is seen as the collective mind of humankind, encompassing all knowledge, ideas, and cultural expressions.

The term "noosphere" was coined by French philosopher Édouard Le Roy and Russian geochemist Vladimir Vernadsky in the early 20th century, though it was later popularized by French Jesuit priest and paleontologist Pierre Teilhard de Chardin. Vernadsky viewed the noosphere as a natural stage in Earth's evolution, a consequence of the biosphere's increasing complexity driven by human intelligence and technological advancement.

Teilhard de Chardin elaborated on this idea, envisioning the noosphere as a dynamic and evolving entity that would eventually lead to a higher state of consciousness for humanity, potentially culminating in an "Omega Point" of ultimate unity and convergence. The concept has influenced various fields, including philosophy, sociology, and environmentalism, offering a framework for understanding the impact of human consciousness on the planet and the potential for collective progress. It can be interpreted in both spiritual and scientific contexts, depending on the perspective.