The theory that 'the Earth is best understood as a living entity that acts to maintain its own existence' is known as
Understanding the Theory of Earth as a Living Entity
The question asks about a specific theory that views Earth as a dynamic, self-regulating entity capable of maintaining conditions favorable for life. Let's examine the given options in the context of this description.
Analyzing the Options
We need to identify which of the provided options best fits the description of Earth acting as a living entity that maintains its own existence.
- Tragedy of Commons: This is an economic theory describing a situation where individuals acting independently and rationally according to their own self-interest behave contrary to the whole group's long-term best interests by depleting some common resource. It focuses on human behavior and resource management, not on Earth as a self-regulating system.
- Sustainability: This concept refers to the ability to maintain something (like ecological balance, human society, or an economy) at a certain rate or level. It's about meeting present needs without compromising the ability of future generations to meet their own needs. While related to the environment, it is a goal or principle for human action, not a theory about Earth acting as a living entity.
- Social Ecology: This is a philosophical and political perspective that links social issues with environmental problems. It suggests that ecological problems are rooted in social problems, particularly hierarchical and dominative structures within society. It's about the relationship between human society and nature, not Earth as a self-regulating entity maintaining its existence.
- Gaia hypothesis: Proposed by James Lovelock and popularized by Lynn Margulis, the Gaia hypothesis posits that life and physical environments on Earth are integrated into a single, self-regulating complex system. This system, called Gaia, maintains conditions on Earth that are suitable for the existence of life. It views Earth as a living entity that actively works to maintain its environment, matching the description in the question precisely.
Based on the analysis, the theory that describes Earth as a living entity maintaining its own existence is the Gaia hypothesis.
Comparison Table: Environmental Concepts
| Concept | Core Idea | Relevance to "Earth as Living Entity" |
|---|---|---|
| Tragedy of Commons | Resource depletion from shared access due to self-interest. | Not related. Focuses on human behavior and resource management. |
| Sustainability | Meeting present needs without compromising future generations. | Related to environmental care, but not a theory of Earth as self-regulating entity. |
| Social Ecology | Environmental problems linked to social issues/hierarchies. | Related to human-nature interaction, but not Earth as self-regulating entity. |
| Gaia Hypothesis | Earth's life and environment form a self-regulating system maintaining life's conditions. | Directly describes Earth as a system acting to maintain its existence. |
Revision Table: Key Environmental Theories
| Theory/Concept | Proponents/Origin | Key Contribution |
|---|---|---|
| Gaia Hypothesis | James Lovelock, Lynn Margulis | Earth as a complex, self-regulating system. |
| Tragedy of Commons | Garrett Hardin (popularized) | Problem of shared, finite resources. |
| Sustainability | Brundtland Commission report | Balanced development for present and future. |
| Social Ecology | Murray Bookchin | Link between social hierarchy and ecological problems. |
Additional Information on the Gaia Hypothesis
The Gaia hypothesis suggests that the biosphere, atmosphere, hydrosphere, and pedosphere are linked as a single, vast, complex cybernetic system. This system has the effect of a feedback loop that maintains the Earth's surface environment within a narrow range of conditions that are conducive for life to persist.
Originally met with skepticism, versions of the Gaia hypothesis have stimulated much research in Earth system science and biogeochemistry. The concept has evolved into different forms, from the initial strong Gaia hypothesis (where life actively manipulates the environment for its own benefit) to the weaker versions (where life simply influences the environment, and feedback loops emerge). It remains a significant concept in environmental thought.
Important Questions from Polity
In a recent judgement, the Supreme Court of India directed that every protected forest, national park and wildlife sanctuary across the country should have a mandatory eco-sensitive zone (ESZ) of a minimum of
Which one of the following Directive Principles was inserted by the Constitution (42 nd Amendment) Act, 1976?
A common High Court for two or more states can be established by:
Which one among the following is not a Fundamental Right under the Constitution of India?
The Central Vigilance Commission was established on the recommendation of which one of the following Committees?
